First of all pinterest is not an Amazon's product, pinterest is a website where you can tag, pin your photos. It is a very interesting and useful website, it is the 4th most successful traffic driving website.
Well, I have been experimenting with Pinterest for a brief period. During this period I came across some amazing facts and future potential of this social site. I would like to mention them:
Users can easily "Pin" and share photos.
These photos can be segregated under different specified categories.
Pinterest can provide an amazing platform for advertisers and marketeers as they have great opportunity to design an attractive Ad and promotional banner and share it in a viral way to the followers of the particular category to which it may belong, all in a new way.
Though Facebook and Twitter provides similar features, but as Pinterest's niche is based on photos and pictures, hence it will be a step ahead of it with an attractive and user-friendly interface and features.
But I feel like Pinterest have a long way to go for more wonderful outcomes and results.
It is a photo sharing site. it allows you to share theme based photos. You can sort your pins to "boards" and you can even re-pin or like what other people share. Pinterest also serves well for SEO purposes.