You'll find this of Pinterest

Pinterest is the hot new property on the social web. It was getting over 11 million users a week by Dec last year, making it the fastest site in the history of the web to break the 10 million mark. Like all things on the web the easiest way to understand it is to use it and to do so you will have to either have someone who is already registered on the site invite you, or you have to email the site and ask to be invited.  Currently you have to link to Pinterest through your Facebook or Twitter account. Think of it as a pinboard and as you go about the web and find things of interest you can 'pin' them and curate them to your board. Pinterest allows users to follow the activity of other Pinterest users; it derives income from modifying users' affiliate links to commercial sites. It does this by replacing the original affiliate tracking code with a Pinterest version, any affiliate payment is passed to Pinterest instead of the original affiliate. It was reported that in January  it drove more referral traffic to retailers than Linked In, You Tube, and Google+. There have been some concerns raised about a business which is almost entirely based on using images without copyright permission and Getty Images and iStock have expressed some concerns but if something proves to be as popular as this looks like it's going to be then these issues can usually be smoothed over.