that takes as input a set of people who want to have dinner together at a central location. it accesses their foursquare/yelp/facebook/twitter/google (specifically, recent searches in Maps) profiles, extracts home & work locations and eating preferences. accesses MTA (or other public transit) schedules and looks for available restaurants in locations that are convenient for all parties.

middleground is similar, but seems to take just the location inputs - no social media integration, no public transit.