• Associated Press, Wednesday, May 27, 2009 1:15 PM

On stage at the D: All Things Digital conference in San Diego, Twitter's co-founders Biz Stone and Evan Williams said the rapidly growing social media company would eventually charge commercial users a fee for some of its services, although it's still unclear about which ones, the AP reported Wednesday. "There will be a moment when you can fill out a form or something and give us money," Williams said. We're working on it right now."

However, the AP noted that after nearly one hour of questioning, Williams and Stone gave no clear indication of Twitter's business model. Instead, the pair mentioned a revenue stream they were likely to avoid: banner ads. "I think it's probably the least interesting thing we could do," Williams said.

Stone noted that the hype surrounding Twitter won't last forever."If you pay attention to it too much, you can run yourself off the rails," he said. "Pretty soon, everybody's going to hate us."

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