Pinterest is a essentially a digital bulletin board that allows you to "pin" images from various websites so you can return to them later. The beauty of Pinterest is that you can group these pins onto different boards like "Emma's birthday Party" or "Dream Trip to Paris." You can pin items directly from the web or from other pinners on Pinterest. Boards can be public (meaning anyone can see what you post) or secret (meaning only you can see what you post). I have a mixture of public and secret boards. In the former category are shoes and recipes; in the latter are article ideas for my blogs and present ideas for family members.
I don't use Pinterest for genealogy or family history, but many people do. They pin how-to articles, heritage crafts and recipes, links to favorite webpages and upload their own photos and stories. Read about how three pinners use Pinterst for family history here and read tips for how to do it here. Each article has links to genealogy pinners. You can also visit the boards maintained by Ancestry.com, Family Tree Magazine and Genealogy Girl Talks or go to Pinterest and search for '"genealogy."