Not to be outdone by the crazy week of announcements that came out of Las Vegas, Facebook announced that link-sharing service Branch agreed to join the Facebook network for $15 million. The idea, it seems, is to help users bond over interests based on link-sharing. As Branch is best known for its web-based link-sharing that keeps conversations circulating around news stories, it makes sense to assume that Facebook is going to use Branch’s technology to make conversing around breaking stories – particularly in mobile devices – that much easier. How this pans out, precisely, remains to be seen, but it’s a big announcement for the ever-expanding social network.