Facebook is a little late to the game, but the company is working on incorporating the use of the hashtag—the brainchild of Twitter that's used by social networking services like Tumblr, Instagram and Google+. Sources familiar with the project say it's still very much in the works. The hashtag feature will allow Facebook to group conversations so that they can then build around topics, like #PopeFrancis, #Bieberfever, #CPAC, etc. Many people already use hashtags on Facebook, but they only serve as a form of creative expression. Facebook hopes that the feature would give users more reason to stay on the site and click on ads. Our thoughts? #HurryupZuck.