What’s the catch? None, really. Cash back apps act as affiliates for many online merchants, which means that whenever you make a purchase through one of the apps, they get a small commission — but then, they give you a portion of that commission as “cash back”. For example, if I buy a pair of Nike shoes through the Ebates app (or website) and spend $75, Ebates may get a $10 commission but then they’ll pass $7 back to me. It’s basically a way to get sale prices on stuff that isn’t on sale!
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. 
People want to speak their minds and weigh in on subjects they feel passionately about, so building a community into your site is a great way to start a conversation and increase traffic to your website. Implement a robust commenting system through third-party solutions such as Facebook comments or Disqus, or create a dedicated forum where visitors can ask questions. Don’t forget to manage your community to ensure that minimum standards of decorum are met, however.
Online savings accounts usually come with crazy good interest rates to help you grow your money faster (regular in-person banks can’t offer rates as high). We’re fans of CIT Bank and Discover Bank (among others) because their interest rates are often over 25 times the national average. That means the money in your savings account will grow 25 times faster than the pace it’s most likely growing at now. Really, though, you can’t go wrong with pretty much any online savings account that offers over 1.50% APY 🙂
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