BuddyPress.org

It was encountered when the FB user’s name contains full of chinese characters, all characters pass into wp insert users function will be stripped(because wp username is ansi only), it finally added a empty character user_login/user_nicename, also user_url will be http://www.facebook.com/people//XXXXXXX

That user can still login, but cannot access his profile page indeed.

I’d like to suggest the future BP-FBConnect, could use the character test statement, if found incompatible username characters, then just simply replace it with FacebookUser instead.