What are you doing this Friday night? Going to a bar with friends? Going to a movie? Wrong.

If you’re a real web addict you’ll be sitting at your computer waiting for the clock to strike 12:01am EST. That’s when Facebook’s new vanity URLs are going to go live, and the landrush to get one will begin.

And it’s going to be a landrush because it’s a first-come, first-serve basis, as Facebook writes today. It looks like Facebook will give you a bunch of options based on your real name, but you can also pick your own vanity name.

But there are some rules:

Facebook usernames will be available in basic text forms, and you can only choose a single username for your profile and for each of the Pages that you administer. Your username must be at least five characters in length and only include alphanumeric characters (A-Z, 0-9), or a period or full stop (”.”). While usernames are currently available only for Romanized text, we’re looking at how we might support non-Romanized characters in the future.

Choose wisely when you pick a name — or it could well end up like that tattoo you regret later in your life if you pick something like “mileycyrusfanforever.”