I've been GC for 2-3 years now but have been selective about what I've put on Facebook.
I posted JK Rowling's explanation of her tweets & have since had a number of my friends disagreeing with me directly, posting statements about being surrounded by idiots, or unfriending me directly.
These are people I've known, in person, for years. If I'm honest, I'm disappointed that they didn't want to at least talk about it, or be prepared to accept we have different views on this.
I keep reading about lots of people whose friends are becoming GC after JKR stood up for us all, and I'm feeling a bit sorry for myself!