Avatars are more interesting. They say more about you than just some picture of you.
Actually, no, wait, when they are some picture of you, they say a lot, too. You are either arrogant and want people to see you, or you are lazy and lack originality. Don't quote me with what you did it for, I am just saying that is the impression it gives off.
I am unwilling to even do that thing where you put a photo of you on your profile, though. I have recently gone from indifferent to the camera to actively contemptuous of it. I avoid lenses and flashing lights like some sort of mass spread illness of some description.
The few pictures of me that exist are terrible because I am in them.