I have to say, I do use "lol" when talking to friends. Though I don't use it a lot, I'll type it if something really funny happens. In a normal sentence, I would most likely just write "That's funny xD" but sometimes if I'm in a good enough mood, I'll write "Lol, that's great!" I don't like people who overuse it, as in, in every sentence. "Lol, what are you doing?" "Lol, that's cool" "Lol, me too".