There's a Dutch start-up doing much of the same. They have challenges from companies and pay students that win. It's very 'local' and a not a really nice website, but they've been fairly successful in setting up the platform so far. It's called http://www.battleofconcepts.nl/
It's interesting that there are a few Dutch start-ups doing such things. The other one is ReDesignMe.com. Italians have similar thing for advertising bootb.com.
Aleveo is meant to be a global complementary service to innovating, customer feedback and recruiting aiming at providing students with better opportunities, and that is the direction we're keeping.
Moreove, Aleveo is hand managed and filtered by hand, for public ideas. Garbage input doesn't get through, and human filter serves both, the author and the one reading it.
Yet, by having the ideas public, all benefit from the conversation.
Best ideas will be awarded either by companies or directly by Aleveo each month with three awards 1500, 1000 and 500€, no matter where they come from.