Foursquare, the app that lets you check in to certain restaurants and retailers, is being courted by two large companies interested in taking an equity stake in the company; both Microsoft and American Express are battling each other to make an investment in Foursquare, rather than joining together. According to those in the loop, Foursquare is also talking to holders of its convertible debt about converting their debt into equity...Source: http://www.phonearena.com/news/Microsoft-and-American-Express-both-looking-at-buying-a-stake-in-Foursquare_id46877
