This is so you can do a mini-marketing campaign on Twitter with money off coupons as an added enticement.
Here's what it looks like:
Try it out yourself - click / tap this link
If you want to do some product tweets first, that's cool. Close the dialog box straight away, do your product tweeting and then refresh the page to get the choice again.
Enjoy and good luck with your promoting!
PS I'll be adding this feature to the other individual product sharers later.
Watch a video introducing Nifty