Facebook is a dangerous place. I have absolutely no JW friends. Some have asked, none get chosen. I have many ex-JW friends, but in order to be my friend when I don't personally know you, I have to see that you have some radical ex-JW's already as friends.
Still, there's the backdoor- friends of friends can see something you have commented on sometimes.
I found another backdoor that turned out to be a problem for me. I commented about my wife wanting to go to a JW meeting while we were out of town at my non-JW brother's wedding. Since my wife doesn't read FB and nobody who is close friends of hers reads MY stuff on there, it should have been okay. It wasn't even a regular status update. BUT IT WASN'T OKAY. My non-JW sister follows me and "Liked" my comment and she has this strange habit of saving things she likes on FB on her smartphone as photos. She had literally over 1200 photos on her phone and my comment was one of them. At the wedding reception, she showed a new photo to my wife and walked away for a moment. My wife flipped through hundreds of these photos and stopped at my comment and read it. She was mad about what I said about JW's and her wanting to go to a cult meeting. I couldn't even try explain how this wasn't meant for family but was commented to a hugely anonymous group of former JW's. That just wouldn't help matters.
Anyway, I still post generically against the JW's on FB, but never anything really specific at all. Facebook is just a ticking time bomb for anyone that can't be 100% open all of the time. Watch your back there.