I admit I have an aversion to social networking. I had a look around Bebo, Myspace and Facebook and obviously it is very popular, but I just can't go there. I like to see my friends and family in person and if they're far away I enjoy talking on the phone! I like to see the colour of peoples' eyes and hearing the sound of their voice.
The part that I have trouble with is the need for a persona to protect one's true identity. (Trying to stay 'in character' for the purposes of 23 Things has been amusing but I wouldn't want to do it long term)
The other disturbing aspect is that you can't just cancel your membership or erase your profile, it appears you are there forever. No thanks.