PPD means pay per download and can make you a lot of money. You may know it better as surveys.
You know these nasty things when you want to download something you sure came across them. But what if I told you that you can make a lot of money from surveys. I mean you join a survey network such as fileice or sharecash. They pay an average of 1$ per download and all you have to do is upload a file there and spread the survey link. To do this just go to paste bin and write something like free account generator for ... or free ddos tool, just make something up that people want to have.