"Invalid file"?!
 

Why does this keep coming up for me, who's trying to make their social group icon?

I have one that's 200X200...
But it doesn't work!

Ah, sorry. Social Groups are a bit bugged right now. I removed their link from the main navigation bar for that reason. I do plan on eventually fixing them up to make them much more usable, but for the moment...not that great of a feature.