I deleted my facebook account last year after i upgraded to the new timeline which was still a preview to developers only. I was concerned about the lack of privacy at the time, it was only till recently that they included more settings.
The one thing i regretted the most was losing my facebook vanity url. Even after deleting your account your url (facebook.com/username) is gone forever!
you worry over a url?
I have been off Facebook for sometime now for a variety of reasons. People who know me are probably tired of my rants about privacy, data retention, and other Facebook woes. But I have years of pictures on there, and conversations, and memories. I have downloaded a back up of it all but can't bring myself to click that delete button. It'd be like burning my journals!
I guess thats a personal call. After seeing the craigslist killer's subpoena , i d rather not have journals, that all my crazy rants and personal quotes and other moments being presented to cops and lawyers to read and laugh at.