Why? Because I'm just testing the WordPress.com tweetmeme shortcode.
What's that? It's what puts this green 'retweet' button here:
The only way to see if I've understood how to use it properly is to bung it in a post and publish it. Seeing as I'm posting, here's a dramatic photo by James Clear to make it all worthwhile. Click the image to go to his Flickr page.