Promo Code Manager to use on Twitter

I came across a new tool this week called Simkl Promo Manager, which is a free service that enables you to distribute promo codes in exchange for a Tweet.
If you have something people want (coupon code, invitation code, content hidden behind a secret URL, etc.), you can exchange it for a post on a user’s Twitter account or blog using Simkl Promo Manager.

Just add your promo codes to Simkl Promo Manager, and enter what you want users to Tweet. Simkl will then create a special page for your code to give to your users.
Simkl will automatically post your message to user’s Twitter account or blog, then it will check the post and will give the user their code, URL, or whatever you choose.
I tried it out yesterday in a test to give away passes to Affiliate Summit (passes are long gone now), and I liked the system.
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See original post by Shawn Collins