Well this is interesting: Second Life has returned to the latest Top 10 PC Game chart compiled by Nielsen, based on data the venerable ratings service gathers from application activity in 180,000+ US homes. (The latest ratings are from December 2011.) Last June 2011, SL dropped off the Top Ten chart, falling to position eleven, and then last October 2011, fell even further, to rank fifteen. Interestingly, the MMO Dungeons & Dragons online was in the top ten in October, but has been supplanted by SL and another virtual life simulation toy/platform/game/whatever, The Sims 3. At the same time, SL's market share is slightly down from October 2011 to December 2011, falling from .96 to .74. Overall that's a relatively slight drop, but if we look back at the Nielsen charts from 2009, there's a very notable usage falloff: