I suspect this is a custom design some sort, but I'm wondering if any of you have included a live social feed within an email or landing page.
For example, this email from Litmus: Save the Date for The Email Design Conference 2015
We're going to request user-submitted content soon and it would be helpful to have a digital space where we can send updates and build excitement/awareness by showcasing what others have sent us.
Thanks in advance!
That litmus email, looks to be using some CSS wizardry that overwrites the content properties of some containers:
<!-- LIVE DYNAMIC TWEETS IN AN EMAIL AWW YISSS -->
<!-- TWEET #TEDC15 TO SEE YOUR TWEET APPEAR IN THE STREAM! -->
<!-- THIS ENTIRE SECTION SHOWS FOR WEBKIT ONLY, USES DYNAMIC CSS FILE THAT OVERWRITES THE CONTENT PROPERTY FOR EACH EMPTY TWEET DIV - REFER TO THE LINKED STYLESHEET IN THE HEAD TO SEE THE CSS FOR THIS SECTION -->
<!--[if (gte mso 9)|(IE)]>
<div style="font-size: 0px; height: 0px; width: 0px; max-height: 0px; max-width: 0px; line-height: 0px; opacity: 0; overflow: hidden; display: none; mso-hide: all;"><![endif]-->
Pretty clever, but as noted, it will only work for emails loaded in a webkit browser, so something like Gmail within Chrome or Safari.