Twitter has arrived

What was an intriguing tool a year ago is now the winner of StartUp of the Year. They doubled from 500,000 monthly users a little over a year ago to 1 million users last May and quadrupled to 4.5 million users last month.

Quoting a post from last May:

Whatever you may think of Twitter, it is here to stay. The time is now to start figuring out how to incorporate Twitter into your marketing strategy.