Tumlbr at least used to let you add arbitrary HTML to your blog, I remember putting base64 encoded gifs on mine that the browser would render. Unless they remov

Tumlbr at least used to let you add arbitrary HTML to your blog, I remember putting base64 encoded gifs on mine that the browser would render. Unless they removed that (which IMO, would pretty dramatically change the general feel of the site) there's a real limit to what they can block.