"The problem is that the social networks we're creating online don't match the social networks we already have offline,
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Circles deal with this situation directly, and they're central to how Google+ works. You can add others to circles for family, friends, coworkers, neighbors, classmates, or whatever other categories are desired. You can share a Google+ post with specific circles or publicly. Adding a person to a circle doesn't require their permission, making Google+ similar to Twitter in this regard. You're the only person who knows which people are your circles.
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Facebook was an all-or-nothing affair--people were on your friends list or they weren't. Last October, though, Facebook introduced a new groups feature that let people communicate only with various subsets of their friends. The feature isn't as obvious as Google's circles, though."
Presentation: The Real Life Social Network v2
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