Anyone else use Plus 3 network?

Just wondering if anyone else here uses Plus 3 network for logging their exercise. While keeping track of what you do month to month, the site links you up with both a cause (nonprofit beneficiary) and a sponsor (company) who donates to the cause some amount based on your exercise.

I find it an extra motivation that when I exercise, a small donation is being made based on what I log in. http://www.plus3network.com