how is "People who liked it also liked" calculated

I recently added a review for a netgear WG111T wireless adapter.

http://www.productwiki.com/netgear-wg111t/

It's not very good :P  But in the section "People who liked this, also liked" it lists a bunch of other products I reviewed.

I'm just curious how this calculated.  How does it know that I 'like' this product (which I don't :P...i just tagged it as 'have it'?

Y

It's done by tagging.

The algorithm finds the highest overlap between products that have been tapped as "have" or "love" with the current one you're on.

ah coolio.

I've noticed that sometimes something I've never tagged shows up in it, and sometimes the product itself does. When I was adding the foxconn blackops, the blackops showed up in that field.