Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online.
Yes, companies will pay you to install apps (or place ads) on your cell phone and leave them there. These apps often run in the background and track your spending/purchasing habits. If you’re not one to care who knows what groceries you’re buying that week, then this is an easy way to a few extra dollars each year, for free. Here are some of the best money making apps that we have found:
Last but not least, you can also earn money online by building an online community, although the monetization strategies you can pursue will vary a lot depending on your goals. You can build a community with a blog, for example. You can also build an online forum and charge people for membership. You could even build up a Facebook group and use your influence there to sell and promote products.