The Pew Internet & American Life Project released a study(pdf) in May regarding the different search and purchase strategies used to buy goods online. Jack Loechner at The Center for Media Research has already done a good job of recapping the study, but two call outs of particular importance to me were:
1) Participation after the purchase is surprisingly rare.
2) That the “growth of broadband adoption at home and the buzz about online participation in a Web 2.0 world, widespread activity in this arena might be expected. Yet the data in this report do not show this; there is clearly distance between the number of those who contribute and those who lurk.”