Another growing Twitter community consists of brands and companies. Everyone from Starbucks to Verizon and from the Red Cross to United Airlines now has a Twitter account.BBC NEWS | Technology | Can Twitter survive the hype cycle?
"Twitter has changed the way businesses market and communicate with customers," said Marketing Profs' Ann Handley.
"I am a Comcast customer and if I tweet about a problem, I will now get a response via Twitter. This is unprecedented in terms of the way companies have operated in the past. But there are still a lot of companies out there that are not sure how to leverage Twitter."
Twitter itself seems to be in a similar boat when it comes to making money out of the service.
"We are not feeling as dogged as people think about this issue," said Mr Stone.
"We are looking at this this year and want to start showing progress on the revenue front. Right now we have plenty of time and plenty of money in the bank and patient investors. We are here to build a lasting company."