I'm likely to trust people that aren't anonymous, but, you don't HAVE to have your own picture, you can use the default avatars if you want. I just don't like the anonymous option because too many people abuse it. They use it for the simplest things, ya know? Seems silly
I've been talking about sexual things on here and would not want people who knew me to know it was me saying it, so to avoid being recognized (or having what you say on the internet come back to haunt you one day) - its better not to.
Best advice regarding the internet EVER, is anything that you wouldn't want a future employer to see, don't put your name and picture next to it. Rule of thumb.
I like to be able to put the opinions to the face. It doesn't affect my view on the opinion but it just seems more human as opposed to loads of cartoons. I hardly see any real pics on here anymore! Everyone's real face is in hiding!