Yes its been known for sometime that FB has some security issues to say the least. The software is updated frequently which can increase its vulnerability. This is especially true if proper code walk through(s) and tests aren't performed.
Its also easy to forget that very word you type over the internet is stored and can be traced to the original sender. No warrant necessary a good part of the time. Trust me, I know what I'm talking about. Crap, cut and paste this "No FB for me. Why I will never be on FB:" from your thread and put it a search engine. Something to keep in mind...
Even the backend to ps (don't ask me the name) is a modified version of a platform that has had some issues in the past. Quite frankly, there is a reason sci stuff isn't connected to the net. Nothing's 100%, neither is software security...ask Iran, dumbass's
edited to add search string for MVP