Microsoft’s Windows Live Messenger app has achieved something not many can, having moved its way up the second place in the Zynga-stuffed list of top ten most popular apps on the social network, as reported by Read/WriteWeb. This is all in the light of the mammoth popularity of FB gaming as well as the social networking giant’s efforts to find the most effective means of monetizing its games’ popularity.

“While AppData’s Facebook app top 10 is mostly populated by games like Zynga’s popular farming game, Texas HoldEm Poker, FrontierVille and Café World, Microsoft’s instant messenger app Windows Live Messenger is the second most popular app in this list with over 9 million daily active users.”

Despite breaking the game-barrier of FB’s ‘top 10’ list, Microsoft is not over with its expansion into the largest social network in the world. The corporation has a large investment in Facebook, as while it is working on increasing Live Messenger’s popularity on other platforms including the Xbox and mobile handsets , its primary focus when it comes to FB is search integration.

As covered here, Facebook users can search people on Bing, view those individuals’ friends, view friends’ Likes, and a personalized notification bar, all in one search.

Microsoft seems to be very eager to get more involved with Facebook, but with the amount of users involved, it’s no wonder. It’s proving an interesting way for Microsoft to get more involved with personal and social cloud systems.