Twitter stays in San Francisco, moving to Market Street

On April 22, Twitter signed a lease to move its headquarters from Folsom Street to the historic Market Square building on Market Street in San Francisco. Earlier in the week, the San Francisco Board of Supervisors approved a plan that gives Twitter and other companies moving into the Central Market and Tenderloin areas a six-year break on payroll taxes on new employees. Twitter, which has plans to increase its workforce from the current 400 to as many as 3,000 by 2013, had threatened to move from the city to the Peninsula if it didn't get the controversial tax break.