Only on Thursday Google had made the announcement about its new OpenSocial platform and already news in cropping up of developers taking advantage of this open, common platform. In their announcement we knew there were going to be a number of social networking sites that were already onboard with the new API’s, including Salesforce.com, Hi5, LinkedIn, Ning, and of course Google’s Orkut but we weren’t expecting the giants like MySpace or Facebook.

As it turned out MySpace actually is going to take advantage of OpenSocial along with Bebo, another large social networking site. The one clearly left out of this picture was Facebook, in which this launch echoed a mighty blow to with many of the more significant social network sites in the world taking part in a common platform without them. According to Wired, Facebook representatives maintained that they had “still not been briefed on OpenSocial” despite Google stating that they had, and Facebook employees showing up at Google’s developer sandbox event.

Tonight Google is planning to unveil OpenSocial, a new set of API’s which make up a common programming platform specifically built to use on popular social networking sites. The development platform will allow application developers to create third party programs to run on these sites without them having to learn a new platform and rewrite their components for each one.

Not only will the new common platform work on Google’s own Orkut, but has also already seen support from as many as a dozen other popular companies and social networking sites including Oracle, Salesforce.com, Hi5, iLike, LinkedIn, Slide, Ning, Friendster and Plaxo. Flixster, iLike and RockYou already have developers in the onboard. The very popular Facebook, who recently accepted a bid to go with Microsoft over Google and who “opened up” its own platform for 3rd party widgets, is not in the list of sites supporting the API’s, and neither is MySpace.