I've created a "bot" (ran manually a few times per day) that looks for pixeljoint in tweets. twitter.com/pixeljointbot
If a tweet contains a link to an image, the image will be downloaded and tweeted together with the username of the original poster.
Bookmark it :)
Also, an icon is needed for it. Anyone up for doing one? :)
Fixed bot to link to original post (and not poster, some people regarded it as spam).