Launch date: April 2, 2010

Fatal flaw(s): Hard to find friends, no web-based portal

A social-network centered around your love of music, powered by Apple and its iTunes service sounds awesome. Too bad it wasn't. Out the gate Ping lacked ways for people to easily get in touch with their friends who were also using the service, and didn't have a website you could log into outside of iTunes. The good news here is, Apple can, and more than likely will improve the service, so expect this to not make any more fail lists in the future.