London - Online retailing pioneer Amazon Inc. has climbed to the top of the retail social media ranks, thanks in part to the introduction of #AmazonBasket. According to the latest Retail Social Media Benchmark results from eDigitalResearch, since the introduction of the new social media shopping functionality, Amazon has added 700,000 new followers to its U.K. Twitter account in the past six months, bumping them up to second overall, just behind leaders Topshop.