It looks as if Facebook was a little premature in using its Twitter account to announce "Prototypes," a Google Labs-like operation that lets members beta-test new features for the social network and offer feedback.
The tweet offering a screenshot of Prototypes was swiftly deleted--but props to The Next Web for snagging it before it was pulled.
So what are the "prototypes" in question? Facebook seems to be experimenting with desktop notifications, content discovery, and upgrades to its Events invitation service. Next to each test feature is a star-based rating system through which, presumably, users can offer their feedback.
Facebook plans to take the stage at the TechCrunch50 conference in San Francisco early on Tuesday afternoon to make a developer-related announcement. It's pretty likely that this has something to do with it.