Allow opt-ins that allow for ads like: so and so just bought an Omega watch and is therefore clearly better than you!

Efforts in this direction were sidetracked by the Sharper Image(??) vibrator fiasco a couple years back. Opt-ins are very very important.

Finally, the other option is to plug-in a Pinterest model into a FB app. Or better yet piggyback onto Pinterest, replace affiliate links again, and let the litigation fly! (I have a gut feeling that a dozen projects like this must already exist.)