Dennis Crowley, Co-Founder & CEO, Foursquare and Robert Scoble, American Blogger, Technical Evangelist and Author, Rackspace CLose to 30m locations around the world. Started with a couple thousand venues now. 15m users, 4m checkins a day. 600k companies. Using Ec2 at the moment, getting expensive. 170m API calls a day. About 50% of usage is […]