When FB was young and new I wanted to try it out. During the registration process I did the "mistake" to read the terms and conditions where I stopped the registration process. I did this again a few months later and still haven't and will not ever have a FB account nor a WhatsApp or Instagram account. (Well I'm quite sure I have a shadow account from people uploading their phone book). I use request policy to block any requests to FB.
My biggest problem with FB is that it's against the decentralized idea of the WWW.