Nabber is a new service for learning a new language with the help of others online. Think of Nabber as part vocabulary studying tool, part social network.
Here's how Nabber works; you can browse for vocabulary words and phrases translated by other members of the Nabber network. Likewise you can contribute your own translations to the network. Nabber provides space to not only give a translation, but also to provide an explanation of the translation. If you come across a Nabber member who is making a lot of good contributions, you can follow that person to keep up with all of the translations they contribute.