FB has changed so much for the better for me since I've joined an AutoRetro group featuring cars at least 25 years old and since I've started like-ing that group's posts. Now almost half of my feed is filled with photos of old Trabant, Lada or Opel Kadett cars, and I love that. The other half is indeed filled by mothers sharing their kids' stuff, which I don't give a crap about, and some fiery political stuff, which I care about but which I generally ignore, the reason being that there's not that much that I can change, politically-wise, by commenting on the Internet.
I've also found out that I've been a lot more relaxed and generally better off since I've stopped checking my feed on the phone when in public places (tramway, waiting in line at the Post office or at a general store). For those situations I always carry a magazine (the Economist folds really well) or a pocket book with me, and it's been for the best.