In January, I wrote that Facebook’s app ecosystem lacked a marketplace, and that it should copy features from a handful of companies and add a paid-search like mechanism for promotion. Well, Facebook announced the App Center with several of those features – no paid listings – and announced a beta probram to support paid apps. As CNET points out, it’s more of a showcase than a store. It doesn’t end-run Apple’s store, but rather points to mobile apps there. Promotions are driven by user ratings, and there’s no sign of curation or merchandising by Facebook humans. It’s not clear how or whether viral promotion off the marketplace will change. I don’t see any personalization angle yet. While this is a big step in the right direction to support its developers, Facebook has a long way to go.