We all know you shouldn’t over email your subscribers. But we also know that within 4 months, your subscribers quit caring (don’t take it personally — you’re just competing with everything else in the world for their attention). So how can you keep customers engaged with your brand, so that when you do send them emails, they actually open and click?
At MailChimp, we think the answer is Twitter. Oh, and Facebook. And Posterous. And Tumblr. And your blog(s). And Flickr. And YouTube. And dribbble. And RSS-to-email.
You get the point. Try to create content that’s interesting and publish it everywhere, so customers can get to it (and share it) however they want. That way, when you actually send an email, your customers will still be engaged (maybe they remembered that funny video you shared on Facebook, or that really useful tool you linked to on Twitter).
Or will they still be engaged? Is there any data that can actually back that claim up? Why yes there is. So convenient of me you to ask…

