Helped me determine that no one is doing what we are up to at my startup. First to market as far as we know. Platform launches on August 30th but you can sign up early at http://www.joinjune.com if you want to be assured of being in the beta.
You have to consider them for many reasons -- e.g. if you have any success, your more established competitors are well positioned to add that functionality.
Doing a keyword search for 'recruiting platform' and 'professional network' turns up plenty of potential competitors. [/positive helpful]