Social Networking site Twitter's Co-founder Biz Stone leaving Twitter

Isaac "Biz" Stone is moving on from Twitter, just five years after co-founding the microblogging site Twitter that has become integral to the social media scene around the world.

Stone, 37, said on his blog that he will work with the company for many years to come, but that the most effective use of his time now is to "get out of the way" of Twitter's crew.


he says that his plans to focus on helping schools, nonprofits and company advisory boards.
Research firm eMarketer Inc. estimates Twitter will bring in advertising revenue of about $150 million this year.