I think everyone is just copying and pasting a few lines of text at the end of their messages. T-shirt and Utopian games have done theirs especially nicely with images that are the url links...
To figure out how they are doing it, just look at the source text for a webpage and extract the lines of html you need...replacing with your own links and image links of course.
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To figure out how they are doing it, just look at the source text for a webpage and extract the lines of html you need...replacing with your own links and image links of course.