Actually I managed to find a case where Joomla and Pligg type interface have been intigrated.
check it out at
http://www.pspcave.com
I dont have the skills to check the page source and isolate the code enough to create a module for Joomla. But if someone could help with the intigration after getting ahold of this sites address that would be great.
I emailed the webmaster asking about how it was done, I havent heard back.