I do earn money online, but I do not have investments like liowkc had mentioned - stocks and mutual funds.
Once, I played with an online stock-investing company; they even gave you something around $20 when you joined that you can invest and watch it grow. Supposedly, after seeing it grow you would start adding more money from your bank account. Well, I did see some growth, but then the company disappeared. Good thing I didn't invest my own money, LOL!