Sequoia backed Meebo launches Meebo Platform this evening, allowing third party developers to create applications for the Meebo web chat service. They’re celebrating the launch with a big party in San Francisco with hundreds of the company’s closest friends.

Like Facebook Platform and the recently announced MySpace Platform it consists of a set of APIs to give developers access certain user features and information. Developers can create applications that run within MySpace. Developers will be able to include Flash applets and Javascript snippets.

Unlike MySpace and Facebook, however, the platform is not open to all who choose to come. The company is announcing four partners this evening and opening up a sandbox area for developers to build potential applications. Those that Meebo thinks will make the user experience richer, will be permitted to launch.

Four partners are being announced this evening along with the launch: Tokbox (video chat), Talkshoe (conference calls on the fly), Ustream (lifecasting) and Pudding Media (PC to PC VOIP calls).

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