You'll have to read that long-winded disclaimer that nobody actually reads before clicking, "I Agree", to find out whether or not you have a right to privacy. I recommend you do not attempt this activity sober.
Private messaging is not private as such, it just keeps it off the forum for others to see
but it can be read by authorized admin of the site.
i am an admin of a forum and I could if I wanted access anyone's pm's, but in the 5 years I have never ever had reason to.
I think your safe but if you dont feel safe call your cousin and tell them over the ph.
good question,I think so though. but there are certain things I rather not disclose on facebook too,so I can definitley see your concerns. Facebook is super easy to hack into ,but i get on there all the time anyway.