Many green cell phone users out there got another good reason for joy. New German startup named Changers came up with the idea of combining solar powered cell phone chargers with a social network. Social network, founded in 2010, hopes to create a community around online shopping.

Social network will gather eco-conscious and do-gooder users and introduce them to a number of retailers. But the factor of competition also is in use. Changers is based on one principle: when you buy a solar powered cell phone charger and connect the kit to your device, it starts uploading data about the energy generated by the charger and stored in a battery to your account in the social network.