Well, I like FB. The dog rescue I work for communicates via FB (they have secret groups) and it is a very effective way to keep everyone informed about what is going on, hold meetings, and so forth. We have a national, breed specific rescue, so the volunteers are from all over the country. On the rescue's other pages, we all enjoy seeing photos and hearing anecdotes about dogs that have been adopted through us.
I also keep in touch with friends, relatives, and a few dog adopters via FB. I keep up with Bernie Sanders and some favorite authors there.
I rarely post anything personal on my page -- once in awhile, an anecdote about my dog. I share dog information that a lot of people may not know already, and that's about it. Sometimes I annoy my ex-husband (we have been friends for 37 years) by being logical and factual, just for fun. (He is an enlightened being, and I am not.)
I use all the privacy settings, have apps that keep the ads and trackers away, don't play games on there, don't have FB on my phone, and have a complex password, so I figure I'm safe as possible on there. For someone like me, FB isn't a dangerous place. FB is a useful tool ... I don't spend a lot of time on there, but I do check it daily.