Facebook Japan Bans Pseudo Names And Requires ID
asiajin.com
asiajin.com
Facebook completely ignores this aspect.
Some Japanese people have major problems with revealing their name -- either part of it -- online, though. It's not something I've ever encountered in America outside of, say, 1998.
On the other hand, it might help to add some context that, before Facebook, there was Mixi, which requires you to have a working cell phone (with e-mail) for verification. Since you have to submit all of this data (and more) to get a cell phone in Japan, you're already pre-verified if you have one.
It might be a good idea to test this in Japan and see how they cope with it. If they can accept this, then anyone can.