This is why those places suck. I once was on Neopets (yes. haha) and was annoyed when people randomly added me to their friends list without even commenting why.
A comment like "I noticed you like rats, I do too. So I'm adding you" would have been nice. Maybe it's so their account doesn't seem empty...
It's like OMG!! I'M SooO PopularZ, as I HaV Mor FrIenDs ThAn YoUUSS!!! HeHE HE!!!!!1