I just wanted to point out that the Google Plus One and Facebook Likes have now been linked to the home page of Netfleet so that popular listings will get a bit of extra face time with our visitors. Recently liked/+1ed domains will get preference in our algorithm.
The number of likes is factored by the age of the like.
So on day 1 after a like a +1 will rank higher than a +2 where the last like was 3 days ago.
Over time this advantage erodes and the +2 will outrank the +1 again.