Facebook User Names: On Your Marks, Get Set . . .

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:

• Each user will get one user name. You will NOT be able to change or transfer this name to another person, so no user name-squatting or re-selling!
• Your profile will have an easy to find (and publicize) url: facebook.com/username.
• If you registered a new profile since the announcement (Tuesday) or started a Page since May 31st, you will likely be delayed in your ability to get a user name. (Again, they're trying to prevent abuse by squatters.)
• There's a FAQ page, special information for Page administrators, and some special help for Trademarks to assist users through the selection and transition process.

And some fun: a future (fictional) timeline of events as a result of the new feature.