I generally am comfortable with it...to the left there you can see me and my son, and my kids and husband do have their pictures in a few of my relationship hubs and what-not. That said, I don't specifically say which pictures are my kids and which are just pictures from Wikimedia Commons that matched what I was trying to say about a particular toy, book, or other kid-related thing. We also live in a very small out-of-the-way community where everybody knows everybody, and no one is allowed to smoke inside in our 24-unit housing complex, so the half-dozen or so smokers have become the de facto neighborhood watch. If anyone turns up around here that we don't know, everyone knows about it immediately, so I'm not really concerned about my kids' safety.
My husband...I'll post his picture all over the place, if someone decides to hunt him down with less-than-wholesome intentions then it's their own fault what happens to them ;).