diff --git a/nest_frontend/components/base/BoxWordcloud.js b/nest_frontend/components/base/BoxWordcloud.js
index a74cf3d..8bad4f1 100644
--- a/nest_frontend/components/base/BoxWordcloud.js
+++ b/nest_frontend/components/base/BoxWordcloud.js
@@ -1,33 +1,46 @@
-import React from "react"
+import React, { useMemo } from "react"
 import BoxFull from "../base/BoxFull"
 import ReactWordcloud from "@steffo/nest-react-wordcloud"
 import Style from "./BoxWordcloud.module.css"
 
 
 /**
- * A Box which displays a wordcloud.
+ * A {@link BoxFull} which displays a wordcloud.
  *
  * @param words - A list of word objects, made of a string "text" and a number "value"
+ * @param options - Additional options to pass to {@link ReactWordcloud}.
  * @param props - Additional props to pass to the box.
  * @returns {JSX.Element}
  * @constructor
  */
-export default function BoxWordcloud({ words, ...props }) {
+export default function BoxWordcloud({ words, callbacks = {}, ...props }) {
+    const wordcloud = useMemo(
+        () => (
+            <ReactWordcloud
+                options={{
+                    colors: [
+                        "var(--fg-primary)",
+                    ],
+                    fontFamily: "Bree Serif",
+                    fontSizes: [8, 64],
+                    size: undefined,
+                    deterministic: true,
+                    rotations: 0,
+                    rotationAngles: [0, 0],
+                    enableOptimizations: true,
+                    enableTooltip: false,
+                }}
+                words={words}
+                callbacks={callbacks}
+            />
+        ),
+        [words]
+    )
+
     return (
         <BoxFull {...props}>
             <div className={Style.WordcloudContainer}>
-                <ReactWordcloud
-                    options={{
-                        colors: [
-                            "var(--fg-primary)",
-                        ],
-                        fontFamily: "Bree Serif",
-                        fontSizes: [8, 64],
-                        size: undefined,
-                        deterministic: true,
-                    }}
-                    words={words}
-                />
+                {wordcloud}
             </div>
         </BoxFull>
     )
diff --git a/nest_frontend/components/interactive/BadgeFilter.js b/nest_frontend/components/interactive/BadgeFilter.js
index dbfaf90..d4123f7 100644
--- a/nest_frontend/components/interactive/BadgeFilter.js
+++ b/nest_frontend/components/interactive/BadgeFilter.js
@@ -19,7 +19,7 @@ export default function BadgeFilter({ filter }) {
         <Badge
             color={filter.color()}
             icon={filter.icon()}
-            onClickDelete={null}
+            onClickDelete={() => removeFilter(filter)}
         >
             {filter.text()}
         </Badge>
diff --git a/nest_frontend/components/interactive/BoxFilterContains.js b/nest_frontend/components/interactive/BoxFilterContains.js
new file mode 100644
index 0000000..b36f4ee
--- /dev/null
+++ b/nest_frontend/components/interactive/BoxFilterContains.js
@@ -0,0 +1,28 @@
+import React, { useContext, useState } from "react"
+import BoxFull from "../base/BoxFull"
+import useRepositoryViewer from "../../hooks/useRepositoryViewer"
+import useStrings from "../../hooks/useStrings"
+import { ContainsFilter } from "../../utils/Filter"
+import FormInlineText from "./FormInlineText"
+import { faFont } from "@fortawesome/free-solid-svg-icons"
+
+
+export default function BoxFilterContains({ ...props }) {
+    const strings = useStrings()
+    const { appendFilter } = useRepositoryViewer()
+
+    const submit = value => {
+        appendFilter(new ContainsFilter(false, value))
+    }
+
+    // TODO: add this string
+    return (
+        <BoxFull header={strings.filterContains} {...props}>
+            <FormInlineText
+                textIcon={faFont}
+                submit={submit}
+                placeholder={"cat in the box"}
+            />
+        </BoxFull>
+    )
+}
diff --git a/nest_frontend/components/interactive/BoxFilterHashtag.js b/nest_frontend/components/interactive/BoxFilterHashtag.js
new file mode 100644
index 0000000..4096492
--- /dev/null
+++ b/nest_frontend/components/interactive/BoxFilterHashtag.js
@@ -0,0 +1,43 @@
+import React, { useContext, useState } from "react"
+import BoxFull from "../base/BoxFull"
+import FormInline from "../base/FormInline"
+import InputWithIcon from "../base/InputWithIcon"
+import Style from "./BoxConditionUser.module.css"
+import { faAt, faFilter, faFont, faHashtag } from "@fortawesome/free-solid-svg-icons"
+import ButtonIconOnly from "../base/ButtonIconOnly"
+import useRepositoryViewer from "../../hooks/useRepositoryViewer"
+import useStrings from "../../hooks/useStrings"
+import { ContainsFilter, HashtagFilter, UserFilter } from "../../utils/Filter"
+import Condition from "../../utils/Condition"
+import FormInlineText from "./FormInlineText"
+
+
+const INVALID_HASHTAG_CHARACTERS = /([^a-z0-9_\u00c0-\u00d6\u00d8-\u00f6\u00f8-\u00ff\u0100-\u024f\u0253-\u0254\u0256-\u0257\u0300-\u036f\u1e00-\u1eff\u0400-\u04ff\u0500-\u0527\u2de0-\u2dff\ua640-\ua69f\u0591-\u05bf\u05c1-\u05c2\u05c4-\u05c5\u05d0-\u05ea\u05f0-\u05f4\ufb12-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb40-\ufb41\ufb43-\ufb44\ufb46-\ufb4f\u0610-\u061a\u0620-\u065f\u066e-\u06d3\u06d5-\u06dc\u06de-\u06e8\u06ea-\u06ef\u06fa-\u06fc\u0750-\u077f\u08a2-\u08ac\u08e4-\u08fe\ufb50-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe70-\ufe74\ufe76-\ufefc\u200c\u0e01-\u0e3a\u0e40-\u0e4e\u1100-\u11ff\u3130-\u3185\ua960-\ua97f\uac00-\ud7af\ud7b0-\ud7ff\uffa1-\uffdc\u30a1-\u30fa\u30fc-\u30fe\uff66-\uff9f\uff10-\uff19\uff21-\uff3a\uff41-\uff5a\u3041-\u3096\u3099-\u309e\u3400-\u4dbf\u4e00-\u9fff\u20000-\u2a6df\u2a700-\u2b73\u2b740-\u2b81\u2f800-\u2fa1])/g
+
+
+export default function BoxFilterHashtag({ ...props }) {
+    // TODO: Translate this
+    // TODO: and also use a better string maybe
+    const strings = useStrings()
+
+    const { appendFilter } = useRepositoryViewer()
+
+    const validate = value => {
+        return value.replace(INVALID_HASHTAG_CHARACTERS, "")
+    }
+
+    const submit = value => {
+        appendFilter(new HashtagFilter(false, value))
+    }
+
+    return (
+        <BoxFull header={strings.filterHashtag} {...props}>
+            <FormInlineText
+                textIcon={faHashtag}
+                placeholder={"hashtag"}
+                validate={validate}
+                submit={submit}
+            />
+        </BoxFull>
+    )
+}
diff --git a/nest_frontend/components/interactive/BoxFilterUser.js b/nest_frontend/components/interactive/BoxFilterUser.js
new file mode 100644
index 0000000..37d24ea
--- /dev/null
+++ b/nest_frontend/components/interactive/BoxFilterUser.js
@@ -0,0 +1,40 @@
+import React, { useContext, useState } from "react"
+import BoxFull from "../base/BoxFull"
+import FormInline from "../base/FormInline"
+import InputWithIcon from "../base/InputWithIcon"
+import Style from "./BoxConditionUser.module.css"
+import { faAt, faFilter, faFont } from "@fortawesome/free-solid-svg-icons"
+import ButtonIconOnly from "../base/ButtonIconOnly"
+import useRepositoryViewer from "../../hooks/useRepositoryViewer"
+import useStrings from "../../hooks/useStrings"
+import { ContainsFilter, UserFilter } from "../../utils/Filter"
+import Condition from "../../utils/Condition"
+import FormInlineText from "./FormInlineText"
+
+
+export default function BoxFilterUser({ ...props }) {
+    // TODO: Translate this
+    // TODO: and also use a better string maybe
+    const strings = useStrings()
+
+    const { appendFilter } = useRepositoryViewer()
+
+    const validate = value => {
+        return value.replace(/[^a-zA-Z0-9]/g, "")
+    }
+
+    const submit = value => {
+        appendFilter(new UserFilter(false, value))
+    }
+
+    return (
+        <BoxFull header={strings.filterUser} {...props}>
+            <FormInlineText
+                textIcon={faAt}
+                placeholder={"jack"}
+                validate={validate}
+                submit={submit}
+            />
+        </BoxFull>
+    )
+}
diff --git a/nest_frontend/components/interactive/BoxVisualizationWordcloud.js b/nest_frontend/components/interactive/BoxVisualizationWordcloud.js
index 0c44d2d..543274e 100644
--- a/nest_frontend/components/interactive/BoxVisualizationWordcloud.js
+++ b/nest_frontend/components/interactive/BoxVisualizationWordcloud.js
@@ -4,11 +4,12 @@ import ContextLanguage from "../../contexts/ContextLanguage"
 import BoxFull from "../base/BoxFull"
 import Empty from "./Empty"
 import ContextRepositoryViewer from "../../contexts/ContextRepositoryViewer"
+import { ContainsFilter } from "../../utils/Filter"
 
 
 export default function BoxVisualizationWordcloud({ ...props }) {
     const { strings } = useContext(ContextLanguage)
-    const {words} = useContext(ContextRepositoryViewer)
+    const {words, appendFilter} = useContext(ContextRepositoryViewer)
 
     if(words.length === 0) {
         return (
@@ -18,7 +19,16 @@ export default function BoxVisualizationWordcloud({ ...props }) {
         )
     }
 
+    const onWordClick = word => {
+        appendFilter(new ContainsFilter(false, word.text))
+    }
+
     return (
-        <BoxWordcloud header={strings.wordcloud} words={words} {...props}/>
+        <BoxWordcloud
+            header={strings.wordcloud}
+            words={words}
+            callbacks={{onWordClick}}
+            {...props}
+        />
     )
 }
diff --git a/nest_frontend/components/interactive/FormInlineText.js b/nest_frontend/components/interactive/FormInlineText.js
new file mode 100644
index 0000000..660e4aa
--- /dev/null
+++ b/nest_frontend/components/interactive/FormInlineText.js
@@ -0,0 +1,39 @@
+import React, { useState } from "react"
+import FormInline from "../base/FormInline"
+import InputWithIcon from "../base/InputWithIcon"
+import { faPlus } from "@fortawesome/free-solid-svg-icons"
+import ButtonIconOnly from "../base/ButtonIconOnly"
+import Style from "./FormInlineText.module.css"
+
+
+export default function FormInlineText({ textIcon, placeholder, buttonIcon = faPlus, buttonColor = "Green", validate = value => value, submit, ...props }) {
+    const [value, setValue] = useState("")
+
+    const _onSubmit = event => {
+        event.preventDefault()
+        submit(value)
+        setValue("")
+    }
+
+    const _onChange = event => {
+        setValue(validate(event.target.value))
+    }
+
+    return (
+        <FormInline onSubmit={_onSubmit} {...props}>
+            <InputWithIcon
+                className={Style.Input}
+                icon={textIcon}
+                value={value}
+                onChange={_onChange}
+                placeholder={placeholder}
+            />
+            <ButtonIconOnly
+                className={Style.Button}
+                icon={buttonIcon}
+                color={buttonColor}
+                onClick={_onSubmit}
+            />
+        </FormInline>
+    )
+}
diff --git a/nest_frontend/components/interactive/FormInlineText.module.css b/nest_frontend/components/interactive/FormInlineText.module.css
new file mode 100644
index 0000000..f8b3933
--- /dev/null
+++ b/nest_frontend/components/interactive/FormInlineText.module.css
@@ -0,0 +1,7 @@
+.Input {
+    flex-shrink: 1;
+}
+
+.Button {
+
+}
\ No newline at end of file
diff --git a/nest_frontend/components/interactive/PickerFilter.js b/nest_frontend/components/interactive/PickerFilter.js
index 899166c..4416abf 100644
--- a/nest_frontend/components/interactive/PickerFilter.js
+++ b/nest_frontend/components/interactive/PickerFilter.js
@@ -16,6 +16,12 @@ export default function PickerFilter({ ...props }) {
                 name={"contains"}
                 icon={faFont}
             />
+            <ButtonPicker
+                currentTab={filterTab}
+                setTab={setFilterTab}
+                name={"hashtag"}
+                icon={faHashtag}
+            />
             <ButtonPicker
                 currentTab={filterTab}
                 setTab={setFilterTab}
diff --git a/nest_frontend/components/providers/RepositoryViewer.js b/nest_frontend/components/providers/RepositoryViewer.js
index 75893a9..84de8e3 100644
--- a/nest_frontend/components/providers/RepositoryViewer.js
+++ b/nest_frontend/components/providers/RepositoryViewer.js
@@ -20,6 +20,9 @@ import PickerFilter from "../interactive/PickerFilter"
 import useArrayState from "../../hooks/useArrayState"
 import BoxFilters from "../interactive/BoxFilters"
 import ContextRepositoryViewer from "../../contexts/ContextRepositoryViewer"
+import BoxFilterContains from "../interactive/BoxFilterContains"
+import BoxFilterUser from "../interactive/BoxFilterUser"
+import BoxFilterHashtag from "../interactive/BoxFilterHashtag"
 
 
 export default function RepositoryViewer({ id, className, ...props }) {
@@ -111,8 +114,9 @@ export default function RepositoryViewer({ id, className, ...props }) {
 
             <BoxFilters className={Style.Filters}/>
             <PickerFilter className={Style.FilterPicker}/>
-            {filterTab === "contains" ? "Contains" : null}
-            {filterTab === "user" ? "User" : null}
+            {filterTab === "contains" ? <BoxFilterContains className={Style.AddFilter}/> : null}
+            {filterTab === "hashtag" ? <BoxFilterHashtag className={Style.AddFilter}/> : null}
+            {filterTab === "user" ? <BoxFilterUser className={Style.AddFilter}/> : null}
             {filterTab === "time" ? "Time" : null}
             {filterTab === "location" ? "Location" : null}
         </>
diff --git a/nest_frontend/components/providers/RepositoryViewer.module.css b/nest_frontend/components/providers/RepositoryViewer.module.css
index 47ebd4b..c678bc5 100644
--- a/nest_frontend/components/providers/RepositoryViewer.module.css
+++ b/nest_frontend/components/providers/RepositoryViewer.module.css
@@ -10,7 +10,7 @@
 
     grid-gap: 10px;
     grid-template-columns: 1fr 1fr;
-    grid-template-rows: auto auto 3fr auto 1fr;
+    grid-template-rows: auto auto 1fr auto auto;
 
     width: 100%;
     height: 100%;
diff --git a/nest_frontend/contexts/ContextLanguage.js b/nest_frontend/contexts/ContextLanguage.js
index 8831fff..a48fb29 100644
--- a/nest_frontend/contexts/ContextLanguage.js
+++ b/nest_frontend/contexts/ContextLanguage.js
@@ -1,4 +1,5 @@
 import { createContext } from "react"
+import LocalizationStrings from "../LocalizationStrings"
 
 
 /**
@@ -6,9 +7,11 @@ import { createContext } from "react"
  * - `lang`: a string corresponding to the ISO 639-1 code of the current language
  * - `setLang`: a function to change the current language
  * - `strings`: an object containing all strings of the current language
+ *
+ * Defaults to Italian.
  */
 export default createContext({
-    lang: null,
+    lang: "it",
     setLang: () => console.error("Trying to setLang while outside a ContextServer.Provider!"),
-    strings: null,
+    strings: LocalizationStrings.it,
 })
diff --git a/nest_frontend/hooks/useRepositoryViewer.js b/nest_frontend/hooks/useRepositoryViewer.js
index 4ab4914..20e84f5 100644
--- a/nest_frontend/hooks/useRepositoryViewer.js
+++ b/nest_frontend/hooks/useRepositoryViewer.js
@@ -6,7 +6,7 @@ import ContextRepositoryViewer from "../contexts/ContextRepositoryViewer"
 /**
  * Hook to quickly use {@link ContextRepositoryEditor}.
  */
-export default function useRepositoryEditor() {
+export default function useRepositoryViewer() {
     const context = useContext(ContextRepositoryViewer)
     if(!context) {
         throw new Error("This component must be placed inside a RepositoryViewer.")
diff --git a/nest_frontend/hooks/useStrings.js b/nest_frontend/hooks/useStrings.js
new file mode 100644
index 0000000..4a02c4a
--- /dev/null
+++ b/nest_frontend/hooks/useStrings.js
@@ -0,0 +1,10 @@
+import { useContext } from "react"
+import ContextLanguage from "../contexts/ContextLanguage"
+
+
+/**
+ * Hook to quickly use the strings of {@link ContextLanguage}.
+ */
+export default function useStrings() {
+    return useContext(ContextLanguage).strings
+}
\ No newline at end of file
diff --git a/nest_frontend/utils/Filter.js b/nest_frontend/utils/Filter.js
index f9525ce..8e88463 100644
--- a/nest_frontend/utils/Filter.js
+++ b/nest_frontend/utils/Filter.js
@@ -1,8 +1,8 @@
-import { Location } from "../components/interactive/location"
+import {Location} from "./location"
 import {
     faAt,
     faFilter,
-    faFont,
+    faFont, faHashtag,
     faLocationArrow,
     faMap,
     faMapMarkerAlt,
@@ -64,6 +64,24 @@ export class ContainsFilter extends Filter {
 }
 
 
+export class HashtagFilter extends ContainsFilter {
+    hashtag
+
+    constructor(negate, hashtag) {
+        super(negate, `#${hashtag}`);
+        this.hashtag = hashtag
+    }
+
+    icon() {
+        return faHashtag
+    }
+
+    text() {
+        return this.hashtag
+    }
+}
+
+
 export class UserFilter extends Filter {
     user