With 24 million unique visitors during March, Target.com was ranked 47th on the comScore Media Metrix listing of the top 50 U.S. Web properties for March. That’s an improvement from March 2011 when Target didn’t crack the top 50. The only other conventional retailer in the top 50 was 25th ranked Walmart.com with 39 million unique visitors. It was ranked 33rd last year with 31.7 million unique visitors in March.