"[...] Facebook sent me a cease-and-desist letter. The company demanded that I take down the tool. It also told me that it had permanently disabled my Facebook account ... Pointing to a provision in its terms of service that purports to bind even former users of Facebook, Facebook also demanded that I never again create a tool that interacts with Facebook or its many other services in any way."
Given that it’s very difficult to actually delete your FB account (it will stay around for a year and undelete if you ever log back in), it seems like this is a good way to get your account actually deleted.