Twitter tax

EVAN DUCHARME/SPECIAL TO THE S.F. EXAMINERProtesters gathered outside Twitter's headquarters this morning to protest the social media company's IPO.

Twitter IPO highlights big money friction in San Francisco

Twitter Inc's initial public offering marks something of a coming out party…

Mike Koozmin/The S.F. ExaminerMayor Ed Lee walks through the mid-Market Street corridor Monday. Lee has made luring companies to the blighted stretch a priority

Has Twitter made San Francisco’s mid-Market soar?

Mayor Ed Lee took a walk down Market Street on Monday. He…