I don't want to be confrontational but I have just deleted my facebook and twitter accts and have checked with friends, there were no records of my posts pics or anything, I just disappeared and other peoples posts were as they were before, just minus my posts. I understand that they are different sites and have different programming, but as I said I am just adding to the conversation here as I am also thinking about leaving but for personal reasons, not the site just me!!
The site has been great to me but now I have changed and feel I must move on.
I am not asking for my acct to be deleted I will just stop logging in, but you did ask for examples of sites that allow you to delete your acct, and here are 2 big ones.
Twitter does save your stuff for 30 days though so you can log back in but you are not on the site, just saved in the files