Facebook has just sent us an invitation to a special event that’s happening this Wednesday. The theme? Mobile.

We don’t know what Facebook is planning to launch (though we’ll do our best to find out beforehand), but we have a few guesses. The most obvious is the company’s long-awaited iPad application (it still doesn’t have an official app). It could also include more features that involve Places — Facebook has recently been testing a Deals service that’s connected to Places, and mobile is obviously the best place for users to access those.

And, of course, it could be related to the elusive Facebook Phone, though when we spoke with Mark Zuckerberg about this last month it sounded like the Facebook’s (unconfirmed) custom version of Android was still a ways off. Perhaps it’s a deal to integrate Facebook more deeply into some partner handsets?

Facebook’s last big event was on October 6, when the company rolled out a totally revamped Groups feature.

Oh, and try not to look too hard for hints on the invite. Everyone who did that last time was totally wrong.

Crunchbase

• FACEBOOK

Company: Facebook

Website: facebook.com

Launch Date: February 1, 2004

Funding: $2.34B

Facebook is the world’s largest social network, with over 500 million users. Facebook was founded by Mark Zuckerberg in February 2004, initially as an exclusive network for Harvard students. It was a huge hit: in 2 weeks, half of the schools in the Boston area began demanding a Facebook network. Zuckerberg immediately recruited his friends Dustin Moskovitz and Chris Hughes to help build Facebook, and within four months, Facebook added 30 more college networks. The original idea for the term...

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