Has anyone tried to make a real-time version of an image board like 4chan? I know there are image-based chats (http://dump.fm/chat http://dump.fm/chat for examp

Has anyone tried to make a real-time version of an image board like 4chan? I know there are image-based chats (http://dump.fm/chat http://dump.fm/chat for example) but none of them are threaded. I guess what I'm really after is a "threaded chat" where you can sticky a topic and have it float at the top of your chat dialog with auto-updating replies. Anyone know of something like this?