Good site, you get to know who makes sense to you pretty quickly. I have had 4 progressives including a close relative unfriend me on Facebook because I commented on their left wing rants in a negative way, usually with facts.
Yeah that's a facebook thing. I've taken a vacation from facebook for much the same reasons. I think politics is best discussed between acquaintances rather than close friends. I have a few really close conservative friends who know how to talk politics without burring up and we do that from time to time and have learned the issues that are most important to us outside the ideologies of either side. That is where the gold is in my opinion.