Well I have. You can now find me on Facebook using the url: http://www.facebook.com/JuliusRocas
I experienced no troubles or even lag time when grabbing my own username. It wasn’t even a surprise to see that no one else has claimed it because there may be a billion guys named “Julius” out there, there’s only a handful of those who carry “Rocas” as a last name.
Though I have yet to chance upon someone who’s desired username has already been claimed by someone else, it would be pretty interesting since this is a one-shot deal. Once you’ve confirmed your chosen username, it’s there till kingdom come or when Facebook closes shop.
So, if you feel like it, add me up on Facebook or leave your Facebook URL in the comments below so I can add you up.