Certainly the hottest new social network, Pinterest doesn't have all the functions and features of Facebook quite yet -- basically, you're just posting photos to your different boards, which you can categorize by interest or hobby or whatever. You can also follow your friends' boards and comment on their pins.
And that's it. Pinterest is a simple, visual concept that has a huge, vibrant community of active users. It <a href="http://techcrunch.com/2012/02/07/pinterest-monthly-uniques/" target="_hplink">hit 10 million users faster</a> than any other social network and is now the <a href="https://www.huffpost.com/entry/pinterest-traffic-growth_n_1408088" target="_hplink">third most popular social network</a> in America, trailing only Facebook and Twitter.
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You can <a href="http://pinterest.com/" target="_hplink">request an invitation to join Pinterest here</a>.
Pinterest