Some recent events make me hopeful that major moves are afoot with enhancing panel quality.
Since the beginning of online surveys, there have been questions about how clean the online panels that enable them are. Questions abounded about representativeness, fraud, professional survey takers, inattentive survey takers and the like. The response from panel vendors has been that they have strong measures in place, and that the problems were overstated. Naysayers have claimed bad sample numbers that range from 20-30%. Buyer's of sample were largely in a "trust me" position, since most of the quality measures were in the hands of the panel vendor. Associations (such as ESOMAR and ARF), have come up with protocols that all good panels should follow, and many have.