diff --git a/extension/background.ts b/extension/background.ts
index acc1c4b..d6d2e28 100644
--- a/extension/background.ts
+++ b/extension/background.ts
@@ -5,34 +5,37 @@ const MIGRATION = ':MIGRATION'
 
 const CURRENT_VERSION = 100021;
 
+const badIdentifiersReasons: { [id: string]: BadIdentifierReason } = {};
+const badIdentifiers: { [id: string]: true } = {};
+
 // If a user labels one of these URLs, they're making a mistake. Ignore the label.
 // This list includes:
-// * Social networks that are not supported
+// * Social networks that are not supported (SN)
 // * System pages of supported social networks
-// * Archival and link shortening sites.
+// * Archival and link shortening sites. (AR)
 // * Reddit bots.
 const badIdentifiersArray = [
-    'archive.is',
-    'archive.org',
-    'ask.fm',
+    'archive.is=AR',
+    'archive.org=AR',
+    'ask.fm=SN',
     'assets.tumblr.com',
     'bing.com',
     'bit.ly',
     'blogspot.com',
     'change.org',
     'chrome.google.com',
-    'curiouscat.me',
-    'deviantart.com',
-    'discord-store.com',
-    'discord.gg',
-    'discordapp.com',
+    'curiouscat.me=SN',
+    'deviantart.com=SN',
+    'discord-store.com=SN',
+    'discord.gg=SN',
+    'discordapp.com=SN',
     'disqus.com',
     'docs.google.com',
     'drive.google.com',
     'duckduckgo.com',
     'en.wikipedia.org',
     'en.wikiquote.org',
-    'etsy.com',
+    'etsy.com=SN',
     'facebook.com',
     'facebook.com/a',
     'facebook.com/ad_campaign',
@@ -99,25 +102,25 @@ const badIdentifiersArray = [
     'facebook.com/story.php',
     'facebook.com/ufi',
     'facebook.com/watch',
-    'flickr.com',
+    'flickr.com=SN',
     'goo.gl',
     'google.com',
     'googleusercontent.com',
     'i.imgur.com',
     'i.reddituploads.com',
-    'imdb.com',
+    'imdb.com=SN',
     'imgur.com',
-    'instagram.com',
-    'itunes.apple.com',
-    'ko-fi.com',
-    'linkedin.com',
+    'instagram.com=SN',
+    'itunes.apple.com=SN',
+    'ko-fi.com=SN',
+    'linkedin.com=SN',
     'mail.google.com',
     'media.tumblr.com',
     'medium.com',
     'news.google.com',
-    'patreon.com',
-    'paypal.com',
-    'paypal.me',
+    'patreon.com=SN',
+    'paypal.com=SN',
+    'paypal.me=SN',
     'play.google.com',
     'plus.google.com',
     'rationalwiki.org',
@@ -224,25 +227,29 @@ const badIdentifiersArray = [
     'reddituploads.com',
     'removeddit.com',
     'sites.google.com',
-    'snapchat.com',
-    'soundcloud.com',
-    'steamcommunity.com',
+    'snapchat.com=SN',
+    'soundcloud.com=SN',
+    'steamcommunity.com=SN',
     't.co',
     't.umblr.com',
-    'tapatalk.com',
+    'tapatalk.com=SN',
     'tmblr.co',
     'tumblr.com',
-    'twitch.tv',
+    'twitch.tv=SN',
     'twitter.com',
+    'twitter.com/explore',
     'twitter.com/hashtag',
+    'twitter.com/home',
     'twitter.com/i',
+    'twitter.com/messages',
+    'twitter.com/notifications',
     'twitter.com/search',
     'twitter.com/settings',
     'twitter.com/threader_app',
     'twitter.com/threadreaderapp',
     'twitter.com/who_to_follow',
-    'vimeo.com',
-    'vk.com',
+    'vimeo.com=SN',
+    'vk.com=SN',
     'wikipedia.org',
     'wordpress.com',
     'www.tumblr.com',
@@ -251,9 +258,13 @@ const badIdentifiersArray = [
     'youtube.com/playlist',
     'youtube.com/redirect',
     'youtube.com/watch',
-];
-const badIdentifiers: { [id: string]: true } = {};
-badIdentifiersArray.forEach(x => badIdentifiers[x] = true);
+].map(x => {
+    const arr = x.split('=');
+    const id = arr[0];
+    if (arr[1]) badIdentifiersReasons[id] = <BadIdentifierReason>arr[1];
+    badIdentifiers[id] = true;
+    return id;
+});
 
 var lastSubmissionError: string = null;
 
@@ -321,7 +332,7 @@ browser.runtime.onMessage.addListener<ShinigamiEyesMessage, ShinigamiEyesMessage
         chrome.tabs.query({}, function (tabs) {
             for (var i = 0; i < tabs.length; ++i) {
                 try {
-                    browser.tabs.sendMessage(tabs[i].id, <ShinigamiEyesCommand>{ updateAllLabels: true });
+                    sendMessageToContent(tabs[i].id, null, { updateAllLabels: true });
                 } catch (e) { }
             }
         });
@@ -457,11 +468,11 @@ function saveLabel(response: ShinigamiEyesSubmission) {
         getPendingSubmissions().push(response);
         submitPendingRatings();
         //console.log(response);
-        browser.tabs.sendMessage(response.tabId, <ShinigamiEyesCommand>{ 
+        sendMessageToContent(response.tabId, response.frameId, {
             updateAllLabels: true,
             confirmSetIdentifier: response.identifier,
-            confirmSetLabel: response.mark
-         });
+            confirmSetLabel: response.mark || 'none'
+        });
         //browser.tabs.executeScript(response.tabId, {code: 'updateAllLabels()'});
         return;
     }
@@ -482,6 +493,14 @@ function openOptions() {
     })
 }
 
+
+
+function sendMessageToContent(tabId: number, frameId: number, message: ShinigamiEyesCommand) {
+    const options = frameId === null ? undefined : { frameId: frameId };
+    console.log(message);
+    browser.tabs.sendMessage<ShinigamiEyesCommand, void>(tabId, message, options);
+}
+
 browser.contextMenus.onClicked.addListener(function (info, tab) {
     if (info.menuItemId == 'help') {
         openHelp();
@@ -505,16 +524,18 @@ browser.contextMenus.onClicked.addListener(function (info, tab) {
         // elementId: info.targetElementId,
         debug: <any>overrides.debug
     }, { frameId: frameId }, response => {
-        if (!response.identifier){
-            browser.tabs.sendMessage(response.tabId, <ShinigamiEyesCommand>{ 
-                updateAllLabels: true,
-                confirmSetIdentifier: response.identifier,
-                confirmSetLabel: response.mark
-            });
+        if (!response || !response.identifier) {
             return;
         }
         if (response.mark) {
-            if (badIdentifiers[response.identifier]) return;
+            if (badIdentifiers[response.identifier]) {
+                sendMessageToContent(tabId, frameId, {
+                    confirmSetIdentifier: response.identifier,
+                    confirmSetLabel: 'bad-identifier',
+                    badIdentifierReason: badIdentifiersReasons[response.identifier]
+                });
+                return;
+            }
             if (response.secondaryIdentifier && badIdentifiers[response.secondaryIdentifier])
                 response.secondaryIdentifier = null;
         }
diff --git a/extension/content.ts b/extension/content.ts
index 8f9f284..bd90639 100644
--- a/extension/content.ts
+++ b/extension/content.ts
@@ -530,26 +530,72 @@ function getSnippet(node: HTMLElement) {
     return null;
 }
 
-function displayConfirmation(identifier: string, label: LabelKind){
+function getBadIdentifierReason(identifier: string, url: string) {
+    identifier = identifier || '';
+    url = url || '';
+    if (
+        identifier.startsWith('reddit.com/user/') ||
+        identifier == 'twitter.com/threadreaderapp' ||
+        identifier == 'twitter.com/threader_app') return 'This is user is a bot.';
+    if (identifier == 'twitter.com/hashtag') return 'Hashtags cannot be labeled, only users.';
+    if (url.includes('youtube.com/watch')) return 'Only channels can be labeled, not specific videos.';
+    if (url.includes('wiki') && url.includes('#')) return 'Wiki paragraphs cannot be labeled, only whole articles.';
+    return null;
+}
+
+var previousConfirmationMessage: HTMLElement = null;
+
+function displayConfirmation(identifier: string, label: LabelKind, badIdentifierReason: BadIdentifierReason, url: string) {
+    if (previousConfirmationMessage) {
+        previousConfirmationMessage.remove();
+        previousConfirmationMessage = null;
+    }
+    if (!label) return;
+    if (isSocialNetwork && label != 'bad-identifier') return;
+
     const confirmation = document.createElement('div');
-    confirmation.style.cssText = 'position: fixed; padding: 15px; z-index: 99999999;';
-    confirmation.textContent = identifier + (
-        label == 't-friendly' ? ' will be displayed as trans-friendly' :
-        label == 'transphobic' ? ' will be displayed as anti-trans' :
-        ' has been cleared.'
-    ) + ' on search engines and social networks.'
+    const background =
+        label == 't-friendly' ? '#eaffcf' :
+            label == 'transphobic' ? '#f5d7d7' :
+                '#eeeeee';
+    confirmation.style.cssText = `transition: opacity 7s ease-in-out; opacity: 1; position: fixed; padding: 30px 15px; z-index: 99999999; white-space: pre-wrap; top: 200px; left: 30%; right: 30%; background: ${background}; color: black; font-weight: bold; font-family: Arial; box-shadow: 0px 5px 10px #ddd; border: 1px solid #ccc; font-size: 11pt;`;
+    let text: string;
+
+    if (label == 'bad-identifier') {
+        const displayReason = getBadIdentifierReason(identifier, url);
+        if (displayReason) text = displayReason;
+        else if (badIdentifierReason == 'SN') text = 'This social network is not supported: ' + identifier + '.';
+        else if (badIdentifierReason == 'AR') text = 'This is an archival link, it cannot be labeled: ' + identifier;
+        else text = `This item could not be labeled. Possible reasons:
+ • It doesn't represent a specific user or page
+ • It's not a kind of object supported by Shinigami Eyes
+
+ ${identifier || url}
+`;
+    } else {
+        text = identifier + (
+            label == 't-friendly' ? ' will be displayed as trans-friendly on search engines and social networks.' :
+                label == 'transphobic' ? ' will be displayed as anti-trans on search engines and social networks.' :
+                    ' has been cleared.'
+        );
+    }
+    confirmation.textContent = text;
     document.body.appendChild(confirmation);
+    previousConfirmationMessage = confirmation;
+    confirmation.addEventListener('mousedown', () => confirmation.remove());
+    setTimeout(() => {
+        confirmation.style.opacity = '0';
+    }, 2000);
+
     setTimeout(() => {
         confirmation.remove();
-    }, 3000);
+    }, 9000);
 }
 
 browser.runtime.onMessage.addListener<ShinigamiEyesMessage, ShinigamiEyesSubmission>((message, sender, sendResponse) => {
 
-    if (message.updateAllLabels) {
-        if(!isSocialNetwork && message.confirmSetLabel){
-            displayConfirmation(message.confirmSetIdentifier, message.confirmSetLabel);
-        }
+    if (message.updateAllLabels || message.confirmSetLabel) {
+        displayConfirmation(message.confirmSetIdentifier, message.confirmSetLabel, message.badIdentifierReason, message.url);
         updateAllLabels(true);
         return;
     }
@@ -565,7 +611,10 @@ browser.runtime.onMessage.addListener<ShinigamiEyesMessage, ShinigamiEyesSubmiss
     if (target && (<HTMLAnchorElement>target).href != message.url) target = null;
 
     var identifier = target ? getIdentifier(<HTMLAnchorElement>target) : getIdentifier(message.url);
-    if (!identifier) return;
+    if (!identifier) {
+        displayConfirmation(null, 'bad-identifier', null, message.url);
+        return;
+    }
 
     message.identifier = identifier;
     if (identifier.startsWith('facebook.com/'))
diff --git a/extension/definitions.d.ts b/extension/definitions.d.ts
index 53fafbc..0a721e2 100644
--- a/extension/definitions.d.ts
+++ b/extension/definitions.d.ts
@@ -10,7 +10,7 @@ interface LabelToSolve {
     element: HTMLAnchorElement
     identifier: string
 }
-type LabelKind = 't-friendly' | 'transphobic' | 'none' | '';
+type LabelKind = 't-friendly' | 'transphobic' | 'none' | '' | 'bad-identifier';
 interface ShinigamiEyesSubmission {
     mark?: LabelKind
     url?: string
@@ -35,6 +35,7 @@ interface ShinigamiEyesCommand {
     setTheme?: string
     confirmSetIdentifier?: string
     confirmSetLabel?: LabelKind
+    badIdentifierReason?: BadIdentifierReason
 }
 type LabelMap = { [identifier: string]: LabelKind };
 
@@ -42,3 +43,4 @@ interface ShinigamiEyesMessage extends ShinigamiEyesSubmission, ShinigamiEyesCom
 }
 
 type ContextMenuCommand = 'mark-t-friendly' | 'mark-transphobic' | 'mark-none' | 'help' | 'options';
+type BadIdentifierReason = 'SN' | 'AR';
\ No newline at end of file