Very soon, you'll be intuitively forming groups over the internet by skipping structures.
In other words, you'll just have your own circle of friends with similar tastes (likes / dislikes) across websites. At least Facebook founder Mark Zuckerberg thinks so.
He recently outlined his 'Open Graph' vision which is similar to what semantic recognition technologies like Glue do to simplify social networking.
In Zuckerberg's words , "...the web can become a set of personally and semantically meaningful connections between people and things."

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Zuckerberg outlines Facebook's 'Open Graph' vision