Peer to peer lending is quite good for earning online!
https://btcpop.co/

Basically, the premise is simple. Invest BTC in other people, and they will return your money along with interest. (In reality, it is harder work than this, as some people will default.

But check out the site anyway. You can use its staking pool to earn interest on a variety of altcoins, buy shares of mini "IPOs", and borrow money for other business ideas.

For the safest, easiest to use way of making money there, you can just deposit money to the instant loans account. Your capital is guaranteed safe, and you earn (currently) over 5.5% APR on your money.

You won't get rich fast through this method, but it is a solid way to start investing, and making a bit of side money. :)

Great post, by the way! I'll be keeping my eye on this.