Some 400 Twitter users in Japan gathered to meet Twitter CEO Evan Williams at the third annual Tweetup Japan 2010 event in Tokyo on Friday night.

The event was meant for Twitter users to mingle with each other and the staff of Digital Garage Inc., the Tokyo-based company operating Twitter in Japan, as well as with Williams, who flew in from his home base of San Francisco.

"When we started Twitter four years ago, we had no idea where it would go. But what we learned time and time again from listening to people all over the world is that Twitter is open exchange of information. We strongly believe open exchange of information makes the world a better place," Williams said during the event at Yebisu Garden Place in Shibuya Ward.