Social Discounts Setup
Once activated, a new “ Social Discounts” section will appear under Downloads → Settings → Extensions.
You’ll first want to select the social networks you’d like people to share to, and then select your discount code. By not selecting a discount code, you can use it as a simple sharing tool.
Note that Social Discount codes cannot be used at the same time as other discount codes for a single checkout. If your customers already have a discount code for some reason, they will have to choose whether to use their existing discount code or the one automatically applied through the Social Discounts extension.
Note on Twitter: On November 20th 2015 Twitter changed the way the "Tweet" button works. As a result, the discount is now applied when the "Tweet" button is clicked (not when the tweet is published).