SAN FRANCISCO, CA - AUGUST 15:  A demonstrator wears a mask during a protest inside the Bay Area Rapid Transit (BART) Civic Center station on August 15, 2011 in San Francisco, California.  The hacker group "Anonymous" staged a demonstration at a BART station this evening after BART officials turned off cell phne service in its stations last week during a disruptive protest following a fatal shooting of a man by BART police.  (Photo by Justin Sullivan/Getty Images)