[hellweaver666]

I work for a very large e-commerce site and we did a similar test, we found that when we put Facebook like/share buttons on our product pages, social activity increased but it had a severe impact on conversion. My theory at the time was people were simply distracted - the second they saw Facebook, they got lost in all their friends status updates and forgot to come back and complete their purchase.

Edit: I should clarify - the extra traffic we received as a result of the extra social activity was tiny and in no way made up for the damage to conversion.