Blackrock iShares, Gatorade, and Limos.com have all run advertising campaigns on VFN, as well.

FORBES: Social Sports "Fan Card" Service Snags Tim Lincecum, Brett Favre And Over 1,200 Other Athletes

Popchips teamed up with VFN, and the brand saw an 18% sales lift nationally.

FORBES: Social Sports "Fan Card" Service Snags Tim Lincecum, Brett Favre And Over 1,200 Other Athletes

What is unique about VFN is that its assets act as advertising units, can be placed anywhere on the web and are easily accessible on mobile devices.

FORBES: Social Sports "Fan Card" Service Snags Tim Lincecum, Brett Favre And Over 1,200 Other Athletes

Thus far, over 1, 200 athletes have become involved with VFN, including Tim Lincecum, Barry Zito, Matt Cain and Hunter Pence, all members of the World Series-bound San Francisco Giants.

FORBES: Social Sports "Fan Card" Service Snags Tim Lincecum, Brett Favre And Over 1,200 Other Athletes