Impressive MySpace data

I’m not sure exactly what this from MarketClusters means but it sounds good:

MySpace sent more US internet traffic to online retail sites last week than the MSN search engine, according to market research firm Hitwise. It estimates that the third-largest search engine on the web provided 2.33% of online retail traffic for the week ending August 26, while the social networking site generated 2.53%. Google created 14.93% of traffic for the period, while Yahoo generated 4.69%. Google’s recent deal to provide advertising for MySpace is predicted to drive retail traffic from the site even higher by the end of the year.

My question is what does “provided 2.33% of online retail traffic” mean?  Is that from people clicking from adverts or is it simply people moving from MySpace to Amazon or somewhere.  That would be far less interesting.