Before I realized what people were doing I got burned several times by people using this method. What you do is that you find a penny stock is has some news coming up soon. Buy lots of shares in the company. Then you get onto yahoo message boards for that stock,and you promote it a lot under different accounts. So that people will think that it is going to shoot up. They will buy shares,causing it to go up. When it goes up so much sell the shares,and take your profit. A similar method is to create a website,and a robot that picks stocks. The tv hosts that give out stock advice use the principal of this method,but don't always promote stocks they own,so that they will keep their influence etc.