Facebook adds 'hashtag' feature

Facebook Inc, the world's No. 1 social network, is adopting the "hashtag," one of the most recognizable features of its younger rival Twitter, in a move to position its Web service as an important complement to television, sporting events and breaking news. Facebook said on Wednesday that it will begin to roll out the feature on its social network, making it easier for users and advertisers to find hot spots of user activity around specific events or topics. The hashtag, which appears as the # symbol and was first popularized on Twitter, enables users to follow specific topics of conversation within a social network's ever-changing stream of user comments. Facebook users will now be able to group comments on the same topic by typing the hashtag alongside a keyword - such as #election - at the end of a post. The hashtag has proven to be a handy system for social networking users to join online conversations as events unfold in real-time, such as political debates, television shows and sports. And it provides an easy way for advertisers to reach a particular audience.