Biz Stone talks about Twitter & pay services

Twitter is going freemium. There will be both pay and free accounts, says Biz Stone in this BBC interview.

"One of the first things we are going to do explicitly is commercial accounts," he says.

"Twitter will always be free to everyone but you will be able to pay for an additional layer of access to learn more about your Twitter account — get some feedback, some analytics, become a better 'Twitterer'."

Twitter is also considering "licensing and syndication possibilities".

"We can give away this real-time feed of data to other companies such as Google and Bing to give them a better experience for searching Twitter," he says.

We're unique from an internet perspective in that our DNA is in mobile," he says earlier in the interview.

"We started out in texting and then we brought the service to the web."

He explains Twitter's advantage:

"We see over four billion mobile phones active around the world as opposed to the 1.65 billion active web accounts, so when you look at this together you see a very broad potential for growth for Twitter."

A memo leaked from the company earlier this year suggested that the firm wanted to reach a billion users by 2013.

However, Twitter is still finding its way, according to Stone.

"We are coming out of a very rapid growth over the last two years," he says. "We have a lot of work to do."