I've just been applauding people. I suppose that's not saying much, but I feel like the facebook system has schooled me not to just say "hey that's cool" or "I also appreciate this thing" or "haha." On the one hand, it leads to me making more thoughtful comments, but on the other, I make FEWER. So when I do communicate, it's better quality, but I do it a lot less, on the whole, I think.