Today’s "what a clever use of social media" shout-out comes to us from French automaker, Renault, whose recent Facebook campaign grabbed the hearts of many. How? With a sweet story about a little old lady named Grandma Hilda who could no longer drive her Renault (did we mention she’s old?) and wanted to give it away to a lucky Renault Facebook fan. All they had to do was figure out where she had misplaced her keys…