I have never been blocked by anyone on FB (as far as I know), and I've never been unfriended by anyone for personal reasons. I stay out of political arguments and such.

The people I blocked weren't harassing me on facebook; I just knew them from a long time ago and don't want to give them the privilege of viewing my profile, even if they just have idle curiosity about me and what I'm doing now.

I blocked one woman that I knew in high school because years earlier, she blew me off at a class reunion and acted like she didn't want to be seen talking to me. I was kind of sad at that because I never did anything to her, and had fond memories of her from grade school. So when I set up my FB profile I blocked her. That was about 2 years ago. Someone mentioned to me recently, that she used my first name for one of the fictional characters that she wrote about in one of her religious blogs. Which is weird, because I have an unusual name; and she even spelled it the same way as mine. (Which is also too coincidental because not only is it an unusual name, it also has different spellings). Not really sure how to interpret this, or if its just sheer coincidence. But its strange.