Following the likes of Twitter, Tumblr, Instagram and pretty much every other social networking service, Facebook has implemented hashtag functionality, allowing users to follow conversations and trending topics more easily than ever before.

As you would expect, clicking on a hashtag takes you to other posts that have used the same hashtag, and users can now lookup hashtags in the search bar, connecting the hashtags with posts from other sites that have used them.

The feature has been implemented in just 20% of users so far, with Facebook expecting it to be extended to all users over coming weeks.

Advertising opportunities were a big drive in Facebook finally including the feature. Speaking on the power of hashtagged conversations , Justin Ososky, Director of platform parnterships and operations at Facebook said, “Between 88 and 100 million Americans log in to Facebook every night during prime time TV hours, which represents a significant opportunity for broadcasters, advertisers and our other partners.” He also noted that a recent episode of Game of Thrones, and I’m sure fans can guess which one, generated over 1.5 million mentions on Facebook.