Well, I don't think people should push you to put up a picture of yourself if you don't want to, especially considering the track record of this site for having lots of people who aren't all that interested in learning language.
For me, it's not really a big deal. I'm not so good looking that people are going to take my picture and use it somewhere else ^^ haha. That and I would imagine males get less harassment and unwanted messages than women do, so it's more reasonable. I am more bothered when people ask me what my full name is or what my address is.
Well, I don't have a blog so it's not a worry of mine. Like many young westerners, I have a facebook page, but of course only my friends can view pictures on it and even then, pictures of myself are somewhat scarce.
The internet is not always the safest of places. You should never do anything you're not comfortable doing, even if people keep encouraging you to do it. If you don't want to post a personal picture, you probably shouldn't.