Twitter Retiring Lead Generation Card
Twitter will be retiring the Twitter Lead Generation Card feature, effective January 10, 2017. After this date, you’ll no longer be able to create new Lead Generation Cards, and existing cards will stop passing information back to your MailChimp account.
Existing, but inactive, Lead Generation Cards will remain in your Twitter account until February 10, 2017, so you can export any leads collected prior to January 10 and import them into your MailChimp account.
Let me explain why this is being retired:
32,902 impressions, no leads, no money for Twitter.