Facebook wants to be the main river ?

A tributary is a stream or river which flows into a main stem (or parent) river. Facebook wants every site on the web to be a tributary. And it wants to be the main river using Open Graph API.

• Basically, the Open Graph API is a way for Facebook to allow other companies, sites, services, etc to interact with Facebook without having to create a dedicated Facebook Page.
• With the Open Graph API, Facebook wants to allow anyone to take their own site and essentially wrap it in a Facebook blanket. This doesn’t necessarily mean in a visual way, but rather that these sites which use the APIs will be able to replicate many of the core Facebook functionality on their own sites.
• So you can imagine that you might be able to create a Facebook-style Wall to include on your site, but able to update your statuses from your site, leave comments, like items, etc. Again, it’s like a Facebook Page, but it would be on your site. And you can only include elements you want, and leave out others.