I totally know what you mean.
My newsfeed consists largely of updates posted by companies and manufacturers I follow like Apple, Gibson, Cakewalk...
I've un-followed a huge bunch of pals one after the other because I ended up being mad at the world before I even had the time to finish my morning coffee.
I started by getting rid of all the people who posted conspiracy theory stuff - that also rid me of most of the pro-marijuana propaganda, most of the alternative medicine junk as well as most of the pseudo-science and supernatural junk.
My other biggest pet peeve is people re-posting things without even verifying. As if the first thing most people think of when they're faced with something that looks too good to be true in 2014 is to share it. :/
Like that mockumentary about sirens... I don't know how many times I bursted that bubble. But then people don't read comments, so you inevitably have a bunch of them adding comments after you've posted a link that says "HOAX"... OMG, Sirens really exist! I knew it in my heart!!!
Meh....
Me, I try to keep a balance. I don't see the point in debating politics on FB, especially not in an open debate. Same with religion. I try to keep my posts positive and light. I post about guitars, my cats, my wife, about records that I like, or DVDs that I just bought.
I never posted a pic of my diner though, and I don't intend to.