Prigat, a leading company in the Israeli fruit juice market, has come up with one of the most innovative Facebook campaigns you are ever likely to see. The application works by encouraging users to smile more and share it with their friends and the more users smile the more juice gets squeezed in a real life juicer. The best part is all the bottles of squeezed juice are sent to a charity of your choice. (via thenextweb.com)