Demonstrator Martha Vasquez sits with other demonstrators at the San Francisco Board of Supervisors meeting in San Francisco, Tuesday, April 5, 2011. City lawmakers have approved a tax break to keep Twitter from fleeing San Francisco. The measure passed by the Board of Supervisors 8-3 on Tuesday exempts the microblogging service Twitter from paying payroll tax on new hires if it moves to the city's neglected Mid-Market area. The demonstrators were against the tax exemptions. (AP Photo/Paul Sakuma)

Photo by: Paul Sakuma

Demonstrator Martha Vasquez sits with other demonstrators at the San Francisco Board of Supervisors meeting in San Francisco, Tuesday, April 5, 2011. City lawmakers have approved a tax break to keep Twitter from fleeing San Francisco. The measure passed by the Board of Supervisors 8-3 on Tuesday exempts the microblogging service Twitter from paying payroll tax on new hires if it moves to the city's neglected Mid-Market area. The demonstrators were against the tax exemptions. (AP Photo/Paul Sakuma)