Facebook has released a new app, but its only for celebrities and brands. The company just announced an iOS app called Facebook Mentions, which can be accessed only by people with verified accounts. With Mentions, users can see a somewhat Twitter-like stream of posts that reference them, and they can find trending topics that they might want to engage in for (presumably) brand-building purposes. Most features are reasonably standard Facebook fare, albeit supposedly streamlined for people with extremely active feeds, but Mentions also adds the option of holding a live QA session with fans.