The "!" has become widespread in emails and text messages as a stand-in for showing excitement, friendliness and, occasionally, sarcasm. Exclamation points are good! Or bad! We're not sure!
Editorial note: Whoa! You've found a super-old post here on BuzzFeed, from an earlier era of the site. It doesn't really represent where we are anymore, and may in fact be totally broken, but we're leaving it up as a part of our early history.