Joe from Flixter denotes why this is SO HUGE: his app will run anywhere that the OpenSocial platform is running. Plaxo. Ning. NewsGator. MySpace. No rewriting of apps.

The Open Social announcement is an equivalent to Sun announcing Java in the mid-nineties… The big promise back then was write-once run-everywhere… Java never became the major success for writing end-user apps that Sun had dreamed off, so the jury has to be out. Hopefully the Open Social API designers will keep Java’s history in mind as they take their technology forward.

MS Windows users don’t care whether Mac users can run AutoCAD. Similarly Bebo users won’t give a damn whether or not Facebook or Ning users can run Flixster…. unless Bebo users can share the Flixtser data, their movie reviews, with their friends on other sites.