This sounds... super endorsement-y, but I can promise you that I am in no way affiliated with FeaturePoints. And yes, I am kind of shamelessly self-promoting here.

This is really cool for people that host giveaways, contests, or just want a little extra cash in their amazon/paypal account.

I'm not sure if anyone here has heard of FeaturePoints before, but basically it's an app that lets you download other free apps in exchange for points that get you cool prizes such as amazon gift cards and paypal credit!
If you're going for the paypal credit (which I assume most of you would) 3000 points is equal to five USD.
I know this really sounds like a gimmick that that it probably doesn't work, but I can promise you that it absolutely does! I'm using it myself at the moment and it works great.

So basically, go to featu.re/2h737n to download the app (just copy that into your browser and it will take you right there). You barely have to give any information like email and such, but I think if you download the android version it will ask for payment information, but don't worry, you would only be charged if you bought an app. Most of the ones used for FeaturePoints are free. I know a lot of people wouldn't be comfortable giving out their payment info for something that's supposed to be free, so a lot of people may not want to do this.

If it asks for a friend's referral code, you can type in mine and get an extra fifty points if you want! (This is the shameless self-promoting part. It's not entirely shameless.) My code is: 2H737N

After that, all you need to do is download the available apps and use them for about a minute or so and complete any tutorials, and once you get the points for it you can delete the app!

Um, I guess if you have any questions or doubts about FeaturePoints I can try to answer them? But I think it's really great for people who want to do giveaways and contests but can't really afford it.