SAN FRANCISCO (Reuters) - Microsoft Corp is in talks with social networking company Foursquare about a possible investment, Bloomberg reported on Thursday. The talks are at an advanced stage, but Foursquare is also talking to other potential partners, the report said of the company whose users can "check in" to locations they are visiting and share relevant tips. "This falls squarely in the "rumors and speculation" category," Foursquare spokesman Brendan Lewis said via email. A Microsoft spokesman declined to comment. Foursquare was a start-up darling three years ago. ...{br}{br}View the Entire Article{br}