AddThis website marketing tools provide your site visitors with personalized calls to action, via our Welcome Bar or Marketing Overlay with custom background images, that will increase the rate at which you’d typically acquire email subscribers.
Each visitor can have a custom message personalized to whether they’re a first time/returning visitor, traffic source, campaign code, device, or based on their interests from other sites they've browsed across the AddThis network.
Additional Information
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Introducing the Overlay and Mailchimp Integration
How-To: AddThis