- Facebook is not giving all the user names, for some reasons. (See my earlier post here).
- Facebook usernames are not case sensitive, xyz and xYz and XyZ are the same thing
- Facebook usernames ignore dots, as gmail does. So x.y.z and x.yz and xyz are the same thing.
when i was gonna set my user name. i saw first two problems that u've mentioned. well i don't think that this facility will be successful for facebook users.
Its not a matter of success and failure. Its a matter of being reliable and transparent.