Stone’s Move Leaves Twitter Without Founders’ Full Attention

Twitter Inc. co-founder Biz Stone’s decision to join fellow company alumnus Evan Williams at Obvious Corp. leaves Twitter with none of its creators fully devoted to the microblogging service.

Obvious, a startup incubator that helped give rise to Twitter, will be revamped to focus on “solving big problems” and help develop systems that “improve the world,” Stone said yesterday on his blog. Williams had announced in March that he was stepping away full time from Twitter, though he remains involved in the company.