I have been using IMAutomator; if you see visits on your Google report that come from sites with long addresses and from emails as well as from other social sites, they are probably from IMAutomator. I have been getting about 3% of my visits from it.
Shetoldme,RedGage,and Traffup are free sites where you can post links.
Shetoldme (100%) and RedGage (60%-40% split) also pay you for your ppc's
As far as good backlinks; Shetoldme is ranked highly by Google, RedGage is ranked OK, and Traffup is a close third.