Pretty easy to not expose yourself while still gleaning some benefit.
Personally - I don't think it is possible to go on Facebook and not expose yourself. I was in Naval Intelligence a very long time ago and we could do things you wouldn't believe way back almost 50 years ago. Today anyone who wants to can buy a computer and couple programs to hack just about anyone. The other day there was another FB trickery thing in the news. Whoever they are use a photo to spread a virus. A photo is data which I am sure pretty much everyone knows by now. So they hid the program within the photo. People click the photo and they open the program. Of course they do not know this. The virus spreads by getting into the computer contacts. Of course this has been done before but this time it was on FB. So it spreads to friends and more friends and invades friends list which opens everyone's friends list and on and on. Once you are on FB you are at risk. Most people have no clue. Which of course is why so many go on FB. The more you know the more you will avoid FB like the plague.