From the L.A. Times Technology blog:

Jack Dorsey is back full-time at Twitter, leading product development as executive chairman.

 Dorsey, who is Twitter’s chairman and one its co-founders, has been in talks for the new daily responsibilities since at least last week.

Twitter Chief Executive Dick Costolo announced the new position for Dorsey in a tweet Monday morning, writing: “Excited that Twitter Chairman @jack will be returning to the company day-to-day leading product as Executive Chairman.

Dorsey followed up with a tweet of his own about the move, saying, “Today I’m thrilled to get back to work at @Twitter leading product as Executive Chairman. And yes: leading @Square forevermore as CEO. #200%”

Photo: Jack Dorsey’s Twitter profile picture. Credit: Jack Dorsey/Twitter