I keep mine at exactly 20. I am not going to let Facebook become a full time job. And before anybody tells me that I can turn off their feed, then why bother having them as friends? I know all 20 of them in real life. I keep nobody around who doesn't actually interact with me. If someone wants an add and I decide to grant it, if they don't send a PM in a month, they are gone.

Also be aware that a lot of the Asian users in particular do a "follow". I monitor that as well.

Go to security, blocked, and search for following me. You will be shocked. Then do the same for facebook security. Delete them all!