With many people now joining multiple social networks the problem becomes how to manage them all. I had started using netvibes for that, and then came across this excellent guide written by Steve Hargadon (of Education.ning.com and classroom20 ning fame). He describes using pageflakes to collect the forum posts, video and photo additions etc onto a separate page for each ning ocmmunity he is a member of. I used his method succesfully with Netvibes (though had a rpoblem witht he blogs feed), with the modification of having three sites to a page, with each site in a column).
Follow this link for Steve's guide at his blog.