Last October The Marker section of Haaretz newspaper cited a study which found that during Operation Protective Edge one of six Israelis blocked or defriended a Facebook friend. 60% of the people did it because they disagreed with the content and 52% because they encountered offensive posts.
I am not ashamed to admit that I too was one of those six. Although I am too polite to defriend any one, and it has never been an option, I did block several people who shared or liked opinions, which I felt, were offensive or painful. In addition, I stopped following quite a few friends.
Since then my Facebook page has become a haven where I spend time only with like minded people,
Please keep reading in the Times Of Israel
http://blogs.timesofisrael.com/my-facebook-home-is-my-castle/