Back in 2005, multi-network instant messaging via the web was an emerging technology. Before then, you pretty much were limited to either running multiple desktop programs — one for AIM, another for Yahoo and still another for what was then called MSN Messenger — or a third-party desktop program like Trillian or Adium.
Then a little Bay Area startup named Meebo burst onto the scene. Back then it was just Seth, Elaine and Sandy working out of an apartment and bootstrapping their way. Today, Meebo claims 170 million people use their site each month. Not too shabby, guys! Keep up the great work.
Here's my original post from 2005: Meebo: AJAX Meets Trillian.