There are webmasters all over the place figuring out that they can get users to develop their sites for them that will work for much less than minimum wage. They lure members to the site by promising to pay them for every post that they make, usually not mentioning how much users will earn. Take myLot, for instance. They are legitimate and make payouts monthly, yet there is no single user that can accurately claim to know the algorithm used to determine the amount a member gets paid. Members wind up spending hours and hours on this site, only to find out that at the end of the day, they have made a whopping dollar-fifty. The members that are in it for a bit of fun and extra cash certainly aren't disappointed, but because of the fact the site is offering money for every post, users everywhere think that they can get rich off of this site, when in actuality, they will make a fraction of the money they would make by having a real job.
The trouble with this is that once one site pops up, hundreds of others arise with the same, and often greater, promise, most of them scams that won't pay. There have also been multiple sites that have popped up and shut right down once they found out that they couldn't pay members what they promised.
So if you see a site that seems tempting, or one that says you can make hundreds of dollars but doesn't tell you exactly what you will have to do to make that money, it's probably best to stay away from it. It probably isn't worth your time, especially if you are looking for a career to earn a living.