How do you post a comment.

It sounds like a temporary glitch, it's happened to me before. Try copying the message you want to post, refreshing the page, pasting the message and seeing if it posts then. That's worked for me.

That might be a setting for that user. I'm p sure you can change your profile settings so only certain people or no one can post on your wall.

You're not alone!
I've had that problem since I got a new computer.
It won't allow me to give props or post on anyone's wall - including my own.
A few people have suggested switching browsers, but fanpop seems to be the only place that's affected, so I'm hesitant in doing that. I'm hoping that it's just some kind of fanpop glitch, and that it will eventually be remedied.