Facebook users can search for a specific hashtag using Facebook’s search tool — say putting in the hashtag, #Nepal or #PRISM. Twitter popularized the use of the hashtag, which has subsequently been picked up by other social media sites like Instagram (owned by Facebook),
Tumblr and Pinterest. Twitter’s hashtag use has been very popular for connecting real-time tweets.
There was nothing stopping you from including hashtags in your Facebook post before, it’s just that Facebook didn’t have any real functionality or hashtags were not a clickable search keyword.
Starting immediately, Facebook said Wednesday, “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.”
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. …
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.