Here's an example of a 2x15 matrix: When you refer two friends to the matrix program, they fill Level 1 of your personal 2x15 matrix. Your next 4 referrals enter Level 2 of your personal matrix. Of course, your Level 1 referrals can themselves refer others which become your Level 2 referrals.
The advantages of a matrix program over PTR are that you won't have to click thousands of links just to get a few dollars. You'll usually get paid more faster. Also with a forced matrix program, you can get spillover from your upline.
Here are some good examples.The disadvantage is that the people on the bottom of the matrix will not earn money until they get referrals.
The best one to join is obviously CashCulture....
here's proof