Flashband is a social networking platform specifically aimed at musicians. These guys have been around since 2012 it seems but they have relaunched with more features and more ways to connect with other musicians. A basic outline of how they work would be along the lines of other social networking sites. Create a profile and post to the site to let people know what projects you are working on or to post a collaboration on the site and state what type of talent you are looking for. You can also use the site to post news of upcoming events. Currently this site seems to be mainly focussed on and used by people in the American east coast but maybe they are considering making it accessible to musicians the world over. go take a look if interested.