In November 2009, the prompt changed to "What's happening?" The subtle difference paved the way for Twitter's explosive growth and use as a real-time information network. The site has grown into a platform whereby people exchange links, share photos, break news and learn. No one cares if you're eating a peanut butter and jelly sandwich; we do care what article you're reading, what products you're playing with, and what you think about President Obama's latest speech.
Unlike Facebook, Twitter enables us to engage with public figures, from bubble-gum pop singers to heads of state -- they're all on there. We thought it'd be fun to take a look back and see what celebrities first tweeted when they joined the site. Some got the hang of it, others poked fun at it, some were witty, and one didn't even know "wtf i'm doing" (thanks, Snooki!).
Read on for some of our favorites.