Firefly Network, Inc (originally known as Agents Inc.) was founded in Cambridge, MA in March 1995 and sold to Microsoft in April 1998. It was founded by a group of Engineers from MIT Media Lab and some business people from Harvard Business School, including Pattie Maes (Media Lab professor), Upendra Shardanand, Nick Grouf, Max Metral, David Waxman and Yezdi Lashkari among others. At the media lab, under the supervision of Maes, some of the engineers built a music recommendation system called HOMR (or Helpful Online Music Recommendation Service and preceded by RINGO an email based system) which used collaborative filtering to help navigate the music domain to find other artists and albums that a user might like.