Now you can easily request users share your links on Twitter and Facebook before they can download your content.
This method does not request permissions from the user, so it is less obtrusive than other methods. However, this method is also less "secure" than other methods in that it is possible for a crafty user to get your download link without sharing.
Check out the video description below.
It's my belief that this is a less adversarial way to do things, and users happy to share you content will be more likely to do so because you're not requesting permission to do anything on their behalf. This is a classic "risk reversal" which will likely lead to more shares and more downloads in total.