I voted other, people like to see who they are getting advice from. Today I got a message asking me questions about dogs today, which I was more than happy to answer. I feel like people who hide their picture have something to hide, like maybe they arn't really their actual age or gender. Plus im confident enough to use my pic, so why not.
Tbh, I don't see why people shouldn't post a profile pic on gag. I think it's nice when I can see a face when I answer a question. There might be some catfishes on gag, but I haven't really noticed them yet.
When I was younger I did the whole rate me thing and stupid stuff like that (not on GaG, but Yahoo Answers the old fashioned way! lol nobody did Rate Me on GaG back then).
I'd say underneath it all most are just a little insecure and looking for a little validation. I'd say the same about the girls and guys that post those "is my penis big enough?" and "are my boobs an ok size?" questions. I think wondering whether or not you're attractive enough is all a part of growing up.
As far as the ones who post their faces as profile pics I think that they probably just see GaG as a more inter personal site. There aren't too many members on here so it's easy to get to know people and yeah I think they think posting their picture up brings them closer to other members