Unselfish is an mobile web app that combines dating and charity.
While free to join and browse, unselfish requires a member to donate a small amount to a match's charity in order to communicate with them.
The key benefits are:
higher quality matches
no spam messages
elimination of 'online dating' social stigma
charitable giving is a very romantic
segmentation and matching based on charity preference
event/partnership opportunities with charities and fundraisers
viral adoption though charitable "campaigns"
Right now unselfish is purely a mobile web app, but a desktop version is in the works.
You can look at it here:
http://unselfish.io (open on a mobile phone)