Add all the dating websites as well, they are notorious to not providing an option to delete your account. Here is the list that I complied in my blog, I posted on hacker news yesterday http://nishant.posthaven.com/why-i-cant-delete-my-dating-acc...

eharmony -> only cancel membership

match -> only cancel membership

coffee meet bagel -> only cancel membership

truffle -> delete accounts

okcupid -> will delete account