You're probably blocking social media and/or tracking on sites. If you access the site with none of that, the author's Twitter posts are seen on the blog post i

You're probably blocking social media and/or tracking on sites. If you access the site with none of that, the author's Twitter posts are seen on the blog post itself. If you are blocking it, you get the the plain text version with a link instead of the image. It's the equivalent of the alt attribute in for the <img> HTML tag.