Rolled out a feature just yesterday whereby we issue a discount code in exchange for mentioning us on Twitter. Here's a screencap of the whole sequence and here's the live page with it, just Ctrl-F for "Twitter".
Let me know what you think of this, guys. I'm sure we aren't the first ones to try something like this, but I frankly don't know what to expect. Hence this post... well, that and to brag a bit of course, but that's given.