G+’s most visible feature, Circles, operates like Facebook’s little-used Lists: You sort people you follow into Circles; you can then post messages to, or share things (links, video, photographs) with individuals privately, selected Circles or combinations of Circles, or make ‘public’ posts or sharings that can be found by anyone on the Web.
No Facebookian walled garden. The other big difference from Facebook: It is asymmetric; you don’t have to ‘friend’ someone to follow or message them , but you can block or be blocked. Which is Twitteresque, but then it’s much more than Twitter, with granular control over who you share with, plus lots more power, flexibility and user-friendliness. Like Sparks, which throws up fresh content for you on subjects you’re interested in (which you can then ‘+1’). G+ also plays nice with handhelds: Huddle lets you exchange messages via your phone with groups that you assemble on the fly; and Hangouts — a big hit already — is a group video chat application with little conceits like automatically enlarging the visual of the person speaking, with the video adjusting to bandwidth and device limitations.
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