To the OP:
(My apologies to you ahead of time. This post is not meant to offend however I feel it necessary for you to hear this.)
As a very spiritual person myself, I can understand where you are coming from in your post. However, I do feel the urge to tell you something.
Facebook, or any other website, is not harmful in itself.
They are simply pixels on a screen. Furthermore, Facebook and other websites do serve a useful purpose; to maintain contact with those of your choice. For example, I just recently got in contact with my paternal side of the family of whom I haven't seen or heard from in over 20 years. If it wasn't for Facebook, I may have never contacted them. But now that I have, we are establishing a close relationship with each other, one of which I am very grateful for.
In regards to privacy:
It all boils down to user/individual responsibility. It is your responsibility not to divulge critical personal information on the internet. And I hate bust your bubble, but if you've already joined Facebook, whatever information you've already let out there is out there to stay. Many websites, including Facebook, backup their systems daily and is cached forever. So, in all honesty, leaving Facebook won't change a thing other than preventing future oppurtinities to reveal personal information. And even then, everything about you is already accessible to authorities. Consider all of the cameras on the streets, your cell phone, address, SSN, credit cards, and loans you have, your house or apartment. EVERYTHING you have is tied back to you and your name, date of birth, location, SSN, your family, etc. There is no escaping it. Even by just logging onto the internet, you are sharing yourself. So, in retrospect, Facebook reveals very little more than is already out there. Our individualities are being globalized just by existing. I gaurantee that if I knew your first and last name and a rough estimate of your age, I can easily find your date of birth, place of birth, parents names, any children you've ever had, your parents names, most the places you've ever lived, as well as where you are employed. This is ALL publicly accessible information shared by the governemt online.
Well, my laptop is running out of battery so I have to come to a close very shortly.
In respect to your spirituality and "advice from your guides":
I am not one to typically judge, nor am I judging you, however I do feel as though this may be a misinterpreted message. I'm fairly certain that our angels and guides understand what Facebook is, the uses of it and the harm of it when the users misuse it. However, I'm also sure that they understand exactly what it is that I've said here; that in the grand scheme of things, facebook poses very little threat. And surely they have better and more important things to be advising you on. I am not saying that you are lying or anything like that. I'm merely saying that maybe you should take a step back for a second and review these emotions and messages before acting on them and passing judgement.