Evernote, LinkedIn, Mint….Walmart? The retail giant is now among Mountain View’s leading startup companies following its purchase of Kosmix, the company behind real-time Twitter filter site TweetBeat, medical search engine RightHealth, and topic-specific engine Kosmix. The company has now been transformed into Walmart’s @WalmartLabs division, which aims to create technologies and businesses around social and mobile commerce. Kosmix founders Venky Harinarayan and Anand Rajaraman, as well as the entire Kosmix team, are expected to stay on-board as part of the newly formed…