Jed Cawthorne, CMSWire: Will We Ever Get One Aggregator to Rule Them All? 

This has been a topic near and dear to my heart for a long time, at least dating back to when AIIM hired me as the Director, Systems of Engagement Strategy in 2010. It's a long post about the challenges of connecting different enterprise, and commercial, social networking/productivity services.

Two quick points: first, I didn't start the discussion - it was already going on when I butted in to lament the lack of a protocol like SMTP to support interoperability. And I knew Dion Hinchcliffe had been involved with related efforts for a long time, but I didn't know about the Open Social Foundation work.

Anyway, well worth the read IMO.