This means you'll be able to sign up for a Facebook address with your name after it (i.e. www.facebook.com/joebloggs) rather than a load of random numbers.
Of course, this will be on a first come, first served basis - so if you're hoping to bag /johnsmith, you're probably going to have to be quick.
The changes will go live from 5am on 13 June, and users will be able to bagsy their moniker from then.
However to prevent people "squatting" on names, users that sign up for a profile after 8pm tonight won't be able to apply for a username immediately.
Interestingly Facebook has added that there will be "even more ways" to use your Facebook user name in the future. Better think carefully before you opt for HotStud4u then...