The problem is Facebook. It leads to divorce and to young people posting things that will haunt them in college or their career. I am on facebook but I am cautious. Despite that caution, it may not be enough to blow my cover. If you have a problem, just walk away from it. You can keep your regular account to keep in touch and share photos, but if the meme's and jokes, serious cultish stuff bothers you, either ignore it and walk away or get a second account anonymously and address those things anonymously.
I choose to be fairly open on facebook, but don't allow any JW's as friends. There's still a back door that friends of friends could be JW's, so I have to watch out. I don't post personal info. and I comment on the woes of other ex-JW's whose friends wouldn't know me. Other than that, I wouldn't be able to post about it at all.