found out also a way to get 150 cents (maybe the same, i just can guess cause on ur linked site there is no hint...)
Try to get the "ievony" software / + invention key.
That ievony software is just a tool that connects to your email contacts (just register a new gmail account) and sends invits to your "contacts".
-So create a new gmail account
- import an csv file (with 1500 new contacts (just use excel for generate some email adresse, csv format see gmail help)
- start that ievony tool,
fill in credentials and it will send 1500 invitations
For each email it will grant u 1 credit, 10 credit = 1 cent, 1500 credits is max, so u will be able to receive 150 cents.