One of the greatest things about life is that you can never stop learning. Sure, it may be harder to learn a new language after college, it may be more difficult to pick up a physical sport after your double knee replacement, and you might find it challenging to pick up developing apps for smartphones in your 80s; but this makes the easy lessons that much more valuable. And the lessons that Facebook’s (Nasdaq: FB ) highly-visible IPO has given investors are very easy to learn, making it the best IPO for small investors ever. Below are some of the many lessons you should take away from Facebook.