Facebook’s master plan, announced Wednesday, is to make the rest of the web social:

Social plugins bring Facebook to the rest of the web, offering “instant personalization” on websites, where you’ll see which friends have also logged in there, what their activity is, and a set of recommendations based on their actions.

If you indicate you like an article, a band, a restaurant, etc., a site using Facebook’s open graph protocol can create a persistent relationship with you around that content.

Facebook’s Graph API aims to make developing on its platform much simpler.