If you have join my campaign on "How To Make Money Online", you will notice that you cannot complete the task in pay per post. Why this happen? I have send a email to PPP, and Luke had replied me. Below is the detail:

Hello Louiss, In order to receive payment for a referral, the user must do 4 things: 1.) Create an account on PayPerPost 2.) Submit a blog 3.) Blog must be approved 4.) A post must be paid to them Unfortunately, the majority of your referrals that are signing up are only completing step #1. All 4 steps must be completed in order for you to receive payment. If you do know any of these bloggers, you may want to contact them and try to have them complete the rest of the process. If you have any other questions or concerns, please let me know. Thank you! Luke