MINAYNVILLE ORIGINAL Once upon a time retailers began expanding to the Internet to broaden their reach and remain competitive. These days the trend is in the opposite direction with many online retailers making the jump into physical stores. In our list of up-and-coming shops however the dominant unifying theme is the increased use of social media; each of these increasingly successful companies uses interfaces and marketing that capitalize on the success of social networks like Facebook (NASDAQ:FB) Twitter Pinterest and Reddit.  Polyvore.  Though technically a technology company Polyvore is an online shopping magazine of sorts that offers a unique type ...