When you're on any sort of website, it's the ultimate website. It's basically this:
"I don't really care what you're saying, and/or I haven't read past the first two words. However, I think I should agree, because you're a total moron, and you'll start talking even more if I don't. Oh, and there's something on your chin"
In a nutshell.
someguy: Global warming is a very serious topic today. In fact, it is one of the le-
You: LULZ YA
someguy: *cries* WHY DOESN'T ANYONE UNDERSTAND ME