This app works great! Highly recommend using the post-purchase email feature if you don't want to use a pop up.
RageOn! - The World's Largest All-Over-Print Online Store
10/10 would bang. If you don't have this app, then chalk it up as another reason why you aren't getting laid, and your store is doing terrible.
Best app to get your store featured on Facebook!! Much more affordable and easier to use than the alternatives. Also, you can use the email feature instead of using a pop up so your checkout process is never interrupted.
There is little to no work to be done from the store owner and it drives consistent traffic when the offer is featured in an email after purchase. Plus, you can try it for free and see if it's right for your store