He usually leaves that to Biz Stone, his colleague and Twitter's co-founder.

The initial concept was developed by Adam Rugel and Biz Stone in 2006 at Twitter's original offices under the name "71 miles".

Much has been made of Twitter's role in the "Arab Spring," but Biz Stone cautions that it should remain a "neutral technology."

Twitter is serving more than 800m search queries a day, according to Biz Stone.

Twitter's founders are Evan Williams, Biz Stone and Jack Dorsey.

Biz Stone explained that all messages are instantly indexed and explained the results of the change.

We didn't know we needed to communicate in 140 characters in real-time until Williams dreamt it up with Jack Dorsey and Biz Stone.

Biz Stone (born March 10, 1974) is an American software developer.

Dorsey and Biz Stone decided that SMS text suited the status message idea, and built a prototype of Twitter in about two weeks.

Biz Stone, author of the 2004 "Who Let the Blogs Out?"