Facebook is set to make a major mobile announcement, and from what we're hearing, it's not going to be a Facebook Phone.
We learned last night that the press wouldn't be the only guests attending today's announcement; the company had also invited a slew of developers and brands to attend the event as well. Representatives from the Golden State Warriors, TripIt, Brightkite and others are also at Facebook headquarters for today's launch.
What we've been told is that today's announcement regards Facebook Places. Specifically, it seems like Facebook is finally ready to release its Facebook Places Write API. On September 19, the social network released the Read API, which lets developers access users' checkin data. The Write API, which lets developers actually push checkins to Facebook, was only released to a few select companies such as Foursquare and Gowalla.