In what's being referred to as a modern land grab, Facebook will start allowing it's 200 million users to pick user names for their profiles (and Pages) beginning at Midnight (Eastern Time) this Saturday, June 13th, on a first-come, first-served basis.

There's already quite a bit of hub-bub about this move, with criticism over the process -- and even the decision to provide this feature at all. (Mashable addressed these concerns and posted a poll to gauge opinions.)

Here are some helpful facts: