PLEASANTON, Calif. — Safeway notified its Facebook fans about a new Foursquare promotion at participating Starbucks inside its stores. Foursquare/Starbucks "mayors" get $1 off a new "However-You-Want-It" Starbucks Frappuccino. The offer is valid though June 28. The posting received dozens of comments, several of which were from people who apparently didn't know what Foursquare is. "What? This makes no sense," one Safeway Facebook fan wrote. "What is a foursquare mayor?" wrote another. ...

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