Activists Roberto Hernandez (left) and Erin McElroy (right) block a Facebook bus heading to Menlo Park on 8th at Market streets in San Francisco, Calif., on Tuesday, January 22, 2014.  The San Francisco Metropolitan Transportation Agency votes on  an 18-month pilot plan allowing Google buses to use designated Muni bus stops to pick up and drop off tech commuters to Silicon Valley. Photo: Liz Hafalia, The Chronicle
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