creative_craig - 10:12 pm on Feb 16, 2010 (gmt 0)

A referral from Google (or any search engine) has intent behind it. Not so much from social media sites like FB.

I would have agreed with you on this three months ago - but having just finished an ad campaign on Facebook for a client, the results we had I found to be exceptionally good - I wouldn't say this is the rule for all ad campaigns on Facebook but its certainly encouraging.