Echo Chamber Inside San Francisco BART Station?

NBC Bay Area’s Sam Brock examines the so-called echo chamber inside a BART station.

Photo Credit: NBC Bay Area

This story is from  The SFGate. Read the rest of this News story at http://www.nbcbayarea.com/news/local/Echo-Chamber-Inside-San-Francisco-BART-Station__Bay-Area-510100262.html.

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