"There's a balance here that eBay is going to have to strike, " said JeffChester, executive director of the Center for Digital Democracy, an online privacy advocacy group.
JeffChester of the Center for Digital Democracy says these companies are trying to create a science of targeting that learns everything about individuals and manipulates their weaknesses suggesting that the federal government should look at what role such ads played in convincing people to take out mortgages they should not have.