My part time oline job carrier started from forum posting job for the site mylot.com.Initially it was OK to recover some cost for the time I spent there.Later it was really very hard to earn for the service you offer for posting job there.There is no guaranty or formula to calculate earning even if you post quality contents in mylot.On the other hand , more and more Forum posting services are available now for genuine and hard working persons.You should explore them from the net "which are these trusted sites".