Facebook宣布 开始支持#话题标记功能，以后用户发出的带#标记的话题就和 Twitter 中的一样，是可点击并链接到话题讨论聚集页的。

在隐私保障上，如果用户发的这条内容是公开的，那仍可汇聚到公开的话题页中其他人可检索到；如果只限定朋友可见那其他人不会在话题讨论页中看到你这条内容。

Facebook 官方说人们在 Facebook 上回讨论各式各样的公共话题，无论是体育赛事还是突发新闻，为了把这些会话浮现出来，它们会发布一系列的功能更新。支持#话题标记只是第一步，不久还能呈现趋势话题。

Every day, hundreds of millions of people use Facebook to share their thoughts on big moments happening all around them. Whether it’s talking about a favorite television show, cheering on a hometown sports team or engaging with friends during a breaking news event—people on Facebook connect with their friends about what’s taking place all over the world.

During primetime television alone, there are between 88 and 100 million Americans engaged on Facebook - roughly a Super Bowl-sized audience every single night. The recent "Red Wedding" episode of Game of Thrones, received over 1.5 million mentions on Facebook, representing a significant portion of the 5.2 million people who watched the show. And this year's Oscars buzz reached an all-time high on Facebook with over 66.5 million interactions, including likes, comments, and posts.

To date, there has not been a simple way to see the larger view of what's happening or what people are talking about.

To bring these conversations more to the forefront, we will be rolling out a series of features that surface some of the interesting discussions people are having about public events, people, and topics. As a first step, we are beginning to roll out hashtags on Facebook.

Introducing Hashtags on Facebook
Starting today, hashtags will be clickable on Facebook. Similar to other services like Instagram, Twitter, Tumblr, or Pinterest, hashtags on Facebook allow you to add context to a post or indicate that it is part of a larger discussion. When you click on a hashtag in Facebook, you'll see a feed of what other people and Pages are saying about that event or topic.

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