We built our fraud mitigation system from the ground up. It's rather complicated, but it boils down to properly matching the user on our site against the information available about the real cardholder.
It's not a single acquiring bank to underwrote our merchant account -- we work with several.
Hi Chris Brunner here, from EveryoneAPI.com. I agree that this is not a ripoff of our product. As uqimu stated, we're solving the same problem, but we use very different sources. While social is a component that we utilize, it is not our primary source. hackmorris is correct that we'll be adding more datapoints from social shortly, and uqimu is correct that we don't offer all of it today.
I look forward to checking out the Contactive API, and perhaps even having a discussion with them to see if there is an opportunity for us to work together.
In the meantime, since our product was mentioned here, I'd be happy to field any questions.