There are plenty of people in the world that live through their freelance work, usually at home, usually alone. This has spawned several websites that offer freelancers the chance to come together, and find work a lot easier.
Often, people go through Elance. This website is open to freelancers of almost all skills. People that want work done post up a job opportunity, and then freelancers bid for the work.
For many people, this totally works.
And then you see this.
You may not be able to read all of this, but here's the jist.
The same person has posted the same job twice...but in the second one, they have added comments in capitals. They all basically run along the same line: this is a scam, you will be ripped off, because you will not be paid.