In the modern world of facebook, twitter, and the internet in general, do any of you have a fear of someone discovering you by chance online?

I am naturally paranoid of my little hobby and I have that fear of having someone I know run across one of my online profiles. Since I am still closeted and I believe NOBODY knows about Jenny, I have a fear of someone I know running across a picture of Jenny and somehow put two and two together. Even though there would be slim chance of that happening, there is still a chance (I've seen and heard of weirder internet crossings happen).

For those of you that are still closeted, do you have a large online footprint? As the username hints, I am a geek at heart and want to utilize many of the social websites to network more but at the same time, I want to keep the "evidence" down to a minimum.

Any advice/suggestions? Am I being too paranoid?