manny123 - 1:14 pm on Jun 26, 2011 (gmt 0)
I suspect that there is a SERP benefit of having people "like" your page because these "likes" show up on many public profiles in the section called "Likes and Interests". These "likes" will link back to your FB page. Once search engines figure out what your FB page is (not hard since it's on your site in the form of a "like" button or box) then all they have to do is count how many different FB profiles link to it.
Search google using the site:facebook.com command and you will find billions of examples.
I don't know if this link will stick, but it's a