It sounds like you aren't happy with including work people on your Facebook. I know it is radical but you can eliminate them all! Nothing is going to come of it. If someone asks you (which I doubt) you can say you decided to keep Facebook just for family and immediate friends. I think everyone should understand that. It seems perfectly legitimate.(You don't need to keep someone on FB for a future work reference.)

I only have about 15 people on FB (friends/family) and rarely check it. My FB is open to the public. It isn't that interesting but It has my basic background stuff in case someone wants to check that out. I have way too many pictures of horses from when I was working with them. It would be boring for anyone to scroll through my photos! Now I follow people on Instagram. I think is more interesting. I like to follow people with hobbies or a business that interests me.

If I saw that someone I befriended was selective in what they wanted me to see on their account I would probably eliminate them. However, I don't even know...if people have done that with me...because I don't bother to look. ( I have always suspected you can't really tell if someone has done this.)