ZDNet has this very comprehensive analysis of Facebook’s dilemma regarding OpenSocial – to remain where they are inside their walled garden (and remember it’s a pretty substantial garden in there with lots of people to play with), or to join in OpenSocial.
Quote of the day goes to Anil Dash of Six Apart;
It’s not true to say that Facebook is the new AOL, and it’s oversimplification to say that Facebook’s API is the new Blackbird, or the new Rainman. But Facebook is part of the web. Think of the web, of the Internet itself, as water. Proprietary platforms based on the web are ice cubes. They can, for a time, suspend themselves above the web at large. But over time, they only ever melt into the water. And maybe they make it better when they do.