Ben Hammersley writes: In my current unsubscribing frenzy, I’ve started trying to leave all of the social networking sites I’ve joined in this past year. It’s an interesting thing to attempt, and instructive as to how these sites deal with the request. Friendster, for example, allowed me to cancel my account from the site. A couple of button pushs and I’m outtathere. But both LinkedIn and Ryze tell me to email customer support and beg them to remove me. I wonder how long it will take. More here on a fascinating topic, how to get the hell out of dodge.