Who Tweeted it First is a very cool website that shows you the first person to ever tweet a certain word or phrase. For instance, I can see that this gentleman was the first person to tweet about now President Barak Obama:

Off to the Miami Book Fair and then to see B. Obama talk

— Alex de Carvalho (@alexdc) November 18, 2006

Or that the term "iPad' was first used by this guy who linked to an SNL skit:

LOL - the apple iPad, http://tinyurl.com/28o3gf

— Pranav Chavda (@pranavchavda) March 24, 2007

And since I was curious, I looked up my first mention on Twitter. I was hoping to see my first "at reply", but instead just got my first tweet, which is the embarrassing:

Just had some Pepsi Natural. Tastes a bit different, but it's growing on me

— Matt Birchler (@mattbirchler) March 31, 2009