hmm... Sometimes it can be their webmaster or someone else they have who manages it for them if they're too busy, but usually it is the actual girl.
What some guys will do is ask her to send a picture with their name written on it as proof that it's not some random dude catfishing.
And then there's also guys who ask for pics as proof that it's her, when really all they're trying to do is score freebie photos.