diff --git a/CHANGELOG.md b/CHANGELOG.md
index fbdc82738..7a6bca3a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
   For other users, a fixed-width text representation of the checkbox is shown:
   "[ ]" or "[🗸]".
+### Fixed
+- Telegram previews now supports dark theme
 
 ## [1.121.1] - 2023-07-15
 ### Fixed
diff --git a/src/components/cookies-banner.jsx b/src/components/cookies-warning.jsx
similarity index 97%
rename from src/components/cookies-banner.jsx
rename to src/components/cookies-warning.jsx
index c2dae3a83..cfdc1f33d 100644
--- a/src/components/cookies-banner.jsx
+++ b/src/components/cookies-warning.jsx
@@ -2,7 +2,7 @@ import { useSubscription } from 'use-subscription';
 
 import { cookiesEnabled } from '../services/feat-detection';
 
-export function CookiesBanner() {
+export function CookiesWarning() {
   const enabled = useSubscription(cookiesEnabledSub);
 
   return (
diff --git a/src/components/link-preview/embedly.jsx b/src/components/link-preview/embedly.jsx
index 636a974d1..30cc713ae 100644
--- a/src/components/link-preview/embedly.jsx
+++ b/src/components/link-preview/embedly.jsx
@@ -35,19 +35,19 @@ export default memo(function EmbedlyPreview({ url }) {
   );
 });
 
-let embedlyInitialized = false;
 function initEmbedly() {
-  if (embedlyInitialized) {
-    return;
-  }
-  embedlyInitialized = true;
-
   const id = 'embedly-platform';
   if (document.querySelector(`#${id}`)) {
     return;
   }
   window.embedly =
-    window.embedly || ((...args) => (window.embedly.q = window.embedly.q || []).push(args));
+    window.embedly ||
+    // We have to use the classic 'function()' here (rather than an arrow
+    // function) because of the way Embedly detects the type of this variable.
+    function (...args) {
+      (window.embedly.q = window.embedly.q || []).push(args);
+    };
+
   const script = document.createElement('script');
   script.id = id;
   script.async = true;
diff --git a/src/components/link-preview/telegram.jsx b/src/components/link-preview/telegram.jsx
index ab31fbf6e..5ad0a9f3e 100644
--- a/src/components/link-preview/telegram.jsx
+++ b/src/components/link-preview/telegram.jsx
@@ -1,6 +1,8 @@
 import { useEffect } from 'react';
 import { once } from 'lodash-es';
+import { useSelector } from 'react-redux';
 
+import { darkTheme } from '../select-utils';
 import * as heightCache from './helpers/size-cache';
 import FoldableContent from './helpers/foldable-content';
 
@@ -12,13 +14,14 @@ export function canShowURL(url) {
 
 export default function TelegramPreview({ url }) {
   useEffect(() => void startEventListening(), []);
+  const isDarkTheme = useSelector(darkTheme);
   const [baseURL] = url.match(TG_POST_RE);
 
   return (
     <FoldableContent>
       <div className="telegram-preview link-preview-content">
         <iframe
-          src={`${baseURL}?embed=1`}
+          src={`${baseURL}?embed=1&dark=${isDarkTheme ? '1' : '0'}`}
           data-url={baseURL}
           frameBorder="0"
           scrolling="no"
diff --git a/src/components/signin.jsx b/src/components/signin.jsx
index 345f7aa67..13b2b626c 100644
--- a/src/components/signin.jsx
+++ b/src/components/signin.jsx
@@ -11,7 +11,7 @@ import ErrorBoundary from './error-boundary';
 import { FieldsetWrapper } from './fieldset-wrapper';
 import { Throbber } from './throbber';
 import { providerTitle, useExtAuthProviders } from './ext-auth-helpers';
-import { CookiesBanner } from './cookies-banner';
+import { CookiesWarning } from './cookies-warning';
 import { ExtAuthButtons } from './ext-auth-buttons';
 import UserName from './user-name';
 
@@ -40,7 +40,7 @@ export default memo(function SignInPage() {
         ) : null}
         <div className="col-md-12">
           <h2 className="p-signin-header">Sign in</h2>
-          <CookiesBanner />
+          <CookiesWarning />
           <ErrorBoundary>
             <SignInForm />
             <ResumeForm />
diff --git a/src/components/signup.jsx b/src/components/signup.jsx
index ff2ddd1a6..cad5f4027 100644
--- a/src/components/signup.jsx
+++ b/src/components/signup.jsx
@@ -6,7 +6,7 @@ import { Link } from 'react-router';
 
 import { signedIn } from '../redux/action-creators';
 import SignupForm from './signup-form';
-import { CookiesBanner } from './cookies-banner';
+import { CookiesWarning } from './cookies-warning';
 import { useExtAuthProviders, providerTitle } from './ext-auth-helpers';
 import { ExtAuthButtons, SIGN_UP } from './ext-auth-buttons';
 import { useServerInfo } from './hooks/server-info';
@@ -54,7 +54,7 @@ export default memo(function Signup() {
           <h2 className="p-signin-header">Sign up</h2>
           {showSignUpForm ? (
             <>
-              <CookiesBanner />
+              <CookiesWarning />
               <SignupForm />
               <ExtAuthSignup />
             </>
diff --git a/test/jest/__snapshots__/link-preview.test.jsx.snap b/test/jest/__snapshots__/link-preview.test.jsx.snap
index c885e22cb..3ac7a47b8 100644
--- a/test/jest/__snapshots__/link-preview.test.jsx.snap
+++ b/test/jest/__snapshots__/link-preview.test.jsx.snap
@@ -127,7 +127,7 @@ exports[`LinkPreview > Shows a Telegram preview 1`] = `
             data-url="https://t.me/meowdobot/0000"
             frameborder="0"
             scrolling="no"
-            src="https://t.me/meowdobot/0000?embed=1"
+            src="https://t.me/meowdobot/0000?embed=1&dark=0"
             style="height: 0px;"
           />
         </div>