This has similarities to Thunderclap although this feels a bit disingenuous without disclosing the fact that you're getting compensated for the tweet.
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Thoughts:
• The first campaign is free and the first five retweets are free.
• A bit pricey, but cheaper and likely more effective than buying ads.
* The users have to follow you to receive the DM with your promo code.
Overall, it's a tool that didn't exist before that sounds fruitful. Reminds me of http://www.paywithatweet.com/
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