We just announced a visual update to embedded Tweets on the Twitter developer blog. This latest design will roll out to all embedded Tweets soon.
Want to preview the new design on your staging and development sites? Add a new meta element to your
to opt-in to the new design.
<meta name="twitter:widgets:new-embed-design" content="on">
The new meta element will only be relevant until the new design is launched for all sites and viewers.