Phase one of Facebook’s strategy for world domination: complete. Facebook has announced that over 50,000 websites have integrated Facebook’s new social plugins in just one week. The plugins are a core component of the company’s new Open Graph initiative.

Last week, Facebook launched the Open Graph API and social plugins during its F8 conference in San Francisco. The complex protocol and API create a more personalized web browsing experience, all through Facebook. Social plugins in particular allow users to interact with other websites (for example, “liking” them) without even logging in. This has been a point of contention, confusion, and even government scrutiny.

None of those issues have stopped the rapid growth of Facebook’s Open Graph, though. Last Wednesday, Facebook launched with 75 partners. Now there are over 50,000 websites on board — that’s nearly 300 websites adding Facebook social plugins per hour. Clearly Facebook’s 425+ million users have enticed website owners to jump on the Open Graph bandwagon.

Social plugins are just the first step in Facebook’s ambitious plan to become the central nexus of the web. With this kind of adoption success, it’s tough to find any scenario where Facebook doesn’t take over the web.

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Tags: facebook, facebook open graph, Facebook social plugins, Open Graph, open graph api, social plugins