comScore, Inc., a leader in measuring the digital world, released results from a study of online shopping in Europe. In January 2011, 270.6 million unique visitors in Europe visited sites in the Retail category, representing a market penetration of 74.5 percent of Internet users, up 8.5 percentage points versus last year. Retail sites also showed high penetration in individual markets, reaching at least 75 percent of the total online audience in 7 out of 18 European markets. In 2010, approximately one out of every ten Internet sessions in Europe included a visit to a retail site.