LinkedIn is pretty stingy about their ToS. You even agree to a on-site code audit if they feel your app is in violation (Section 1.8). I haven't used Cubeduel,

LinkedIn is pretty stingy about their ToS. You even agree to a on-site code audit if they feel your app is in violation (Section 1.8). I haven't used Cubeduel, but I wonder if they're displaying user info in violation of: "Data gathered from one user's LinkedIn account/network may not be exposed to another user" Given the huge traffic, not surprised if they're just throttled though.