主题标签
主题标签（英语：hashtag），又称为话题标记、题标，是互联网个元数据标签类型之一，由一个井号（拉新浪微博则是两个井号）加上一个词、单字，或没空格个一句话所构成。通常拉微博搭社交网站帖子里向使用，用来奈各篇独立个帖子串连拉一道。
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