Just ignore it. If you feel that you don't want to offend this person by deleting them, there is a way to block anything they post. I've done that with a few people who insist on telling the world when they eat, go to bed, use the toilet... you know the ones.
Facebook is what you make of it. Ignore the crap, use it to what you want it to be. I use it alot of keep in touch with everybody back home. I don't like to use it for people who live close to me/in laws. At the end of the day, because you didnt "like" the save the puppies page - it doesnt make any difference at all. The big bad person isnt going to suddenly stop what they are doing because of facebook.
Stop for a minute, open your mind, learn. You may not agree with what I say, I may not agree with what you say but we will both learn something new.