This really means a place to store bookmarks, web pages, snippets of pages, documents, etc.  how could this even apply to social media? I’ve tried many different free and commercial solutions (outliners, PIMs, personal knowledge bases, mind mapping software, notebooks/pad, etc.), but none of then were 100% complete in my mind. 

www.absolutebusy.com   AIR LIQUIDE, Argene, Bertrams-Heatec    Germany    Acquia  Acquia is building a portfolio of product and service offerings to assist organizations seeking to build Web sites and applications on the Drupal social publishing system.  Relenet provides social network software platforms that are highly customizable. 

8apps.com - A mixture of social network and productivity applications. Family and Social Collaboration Cozi.com - Helps families organize and communicate in a web based method. Nexo is great for groups of all kinds, so you can include them in the family and social collaboration group as well. Pete Fixed, thanks. Sean P. Regards.