Praise be to Allah.
The website mentioned offers jobs where people can do work from home in return for a fixed fee for each job, or payment by the hour, such as designing websites and banners, or programming, translation, and writing articles. There is nothing wrong with this, so long as the work requested is permissible.
Moreover, the website pays fifty dollars if you invite a friend who joins, once he makes one thousand dollars on the website and receives this payment, or you call another friend who pays one thousand dollars, if he asks for work to be done and pay this amount in return for that.
There is nothing wrong with that either, because that comes under the heading of brokerage, on condition that the friend’s work is permissible.
This is what we were able to find out about the nature of the website’s work, according to what was mentioned in a forum.
And Allah knows best.