I decide whether or not I want to get to know someone better based on their profile pic. If it intrigues me, I'm peruse their profile. If it repels or bores me, I move on.
To some extent, your profile pic reveals more about you than your actual physical appearance does, because you can choose your profile pic, and not so much your nose. Although if I could figure out how to without knives I'd be up for that too.