DoYouDo, Inc. is a Beverly Hills, California company that owns the patent to an anonymous matching service designed to detect mutual attraction between friends or acquaintances based on confidential lists they create of people they are interested in. On September 7, 1999, Israeli businessmen Gil S. Sudai and David J. Blumberg patented the methodology, which represented a departure from the approaches employed by other online dating services and dating systems. It focused on matching up people who already had a non-romantic relationship offline, rather than matching up strangers, and was designed to help solve the problems associated with unwanted romantic overtures on the one hand, and inhibition resulting from fears of unrequited love on the other.