Pinterest is the hottest topic since Twitter or Tumblr hit the scene. But what is it? Pinterest is a social networking website that simply acts as virtual bulletin board. When you find something online—an image, a blog post, an inspirational quote or a photo—you can pin it to your pinboard for everyone to see.
This About.com article explains it well: Create a Virtual Notice Board with Pinterest
One thing to note. Unlike physical pinboards you hang in your office or at home, your Pinterest pinboard can be used to share content with other Pinterest users who are following you. Sharing with others is a great way to discover and recycle new content by repinning it to your own pinboard.
New term, pinaddict: someone who is addicted to pinning images, videos, and blogs to Pinterest (pinterest.com). February 8, 2012 (4:05 p.m.)