In the following video, Fool contributor Matt Thalman discusses three of the key lessons he's learned from the CNBC TV show American Greed.

The first is that if something sounds too good to be true, it probably is. Second, investors should have a very diverse portfolio of investments and not have all their money tied up in one place. Finally, at the end of the day, you personally are the only one that has your best interests at heart 100% of the time.

Click on the video to find out more and how you can better protect your money.

Fool contributor Matt Thalman owns shares of and Facebook. Check back Monday through Friday as Matt explains what caused the Dow's winners and losers of the day, and every Saturday for a weekly recap. Follow Matt on Twitter: @mthalman5513. The Motley Fool recommends and owns shares of and Facebook. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.