diff --git a/built/general.js b/built/general.js
index 16b3cd7..c92d25c 100644
--- a/built/general.js
+++ b/built/general.js
@@ -123,8 +123,15 @@ export default async (_url, lang = null) => {
     const url = typeof _url === 'string' ? new URL(_url) : _url;
     const res = await scpaping(url.href, { lang: lang || undefined });
     const $ = res.$;
-    const twitterCard = $('meta[property="twitter:card"]').attr('content');
+    const twitterCard = $('meta[name="twitter:card"]').attr('content') ||
+        $('meta[property="twitter:card"]').attr('content');
+    // According to docs, name attribute of meta tag is used for twitter card but for compatibility, 
+    // this library will also look for property attribute.
+    // See https://developer.twitter.com/en/docs/twitter-for-websites/cards/overview/summary
+    // Property attribute is used for open graph.
+    // See https://ogp.me/
     let title = $('meta[property="og:title"]').attr('content') ||
+        $('meta[name="twitter:title"]').attr('content') ||
         $('meta[property="twitter:title"]').attr('content') ||
         $('title').text();
     if (title === undefined || title === null) {
@@ -132,25 +139,27 @@ export default async (_url, lang = null) => {
     }
     title = clip(decodeHtml(title), 100);
     let image = $('meta[property="og:image"]').attr('content') ||
+        $('meta[name="twitter:image"]').attr('content') ||
         $('meta[property="twitter:image"]').attr('content') ||
         $('link[rel="image_src"]').attr('href') ||
         $('link[rel="apple-touch-icon"]').attr('href') ||
         $('link[rel="apple-touch-icon image_src"]').attr('href');
     image = image ? (new URL(image, url.href)).href : null;
-    const playerUrl = (twitterCard !== 'summary_large_image' && $('meta[property="twitter:player"]').attr('content')) ||
-        (twitterCard !== 'summary_large_image' && $('meta[name="twitter:player"]').attr('content')) ||
+    const playerUrl = (twitterCard !== 'summary_large_image' && $('meta[name="twitter:player"]').attr('content')) ||
+        (twitterCard !== 'summary_large_image' && $('meta[property="twitter:player"]').attr('content')) ||
         $('meta[property="og:video"]').attr('content') ||
         $('meta[property="og:video:secure_url"]').attr('content') ||
         $('meta[property="og:video:url"]').attr('content');
-    const playerWidth = parseInt($('meta[property="twitter:player:width"]').attr('content') ||
-        $('meta[name="twitter:player:width"]').attr('content') ||
+    const playerWidth = parseInt($('meta[name="twitter:player:width"]').attr('content') ||
+        $('meta[property="twitter:player:width"]').attr('content') ||
         $('meta[property="og:video:width"]').attr('content') ||
         '');
-    const playerHeight = parseInt($('meta[property="twitter:player:height"]').attr('content') ||
-        $('meta[name="twitter:player:height"]').attr('content') ||
+    const playerHeight = parseInt($('meta[name="twitter:player:height"]').attr('content') ||
+        $('meta[property="twitter:player:height"]').attr('content') ||
         $('meta[property="og:video:height"]').attr('content') ||
         '');
     let description = $('meta[property="og:description"]').attr('content') ||
+        $('meta[name="twitter:description"]').attr('content') ||
         $('meta[property="twitter:description"]').attr('content') ||
         $('meta[name="description"]').attr('content');
     description = description
@@ -166,7 +175,9 @@ export default async (_url, lang = null) => {
         $('link[rel="icon"]').attr('href') ||
         '/favicon.ico';
     const activityPub = $('link[rel="alternate"][type="application/activity+json"]').attr('href') || null;
-    const sensitive = $('.tweet').attr('data-possibly-sensitive') === 'true';
+    // https://developer.mixi.co.jp/connect/mixi_plugin/mixi_check/spec_mixi_check/#toc-18-
+    const sensitive = $("meta[property='mixi:content-rating']").attr('content') == '1' ||
+        $('.tweet').attr('data-possibly-sensitive') === 'true';
     const find = async (path) => {
         const target = new URL(path, url.href);
         try {
diff --git a/src/general.ts b/src/general.ts
index b398e08..646a441 100644
--- a/src/general.ts
+++ b/src/general.ts
@@ -217,7 +217,10 @@ export default async (_url: URL | string, lang: string | null = null): Promise<S
 	const activityPub =
 		$('link[rel="alternate"][type="application/activity+json"]').attr('href') || null;
 
-	const sensitive = $('.tweet').attr('data-possibly-sensitive') === 'true'
+	// https://developer.mixi.co.jp/connect/mixi_plugin/mixi_check/spec_mixi_check/#toc-18-
+	const sensitive = 
+		$("meta[property='mixi:content-rating']").attr('content') == '1' ||
+		$('.tweet').attr('data-possibly-sensitive') === 'true'
 
 	const find = async (path: string) => {
 		const target = new URL(path, url.href);