What's so special about shopping bookmarks?

As many people were attracted through social bookmarks, why is it so special anyway? What is the specialty of a shopping bookmark compare to social bookmarks? Is it a good chance for SEO purposes to promote your products? Or can you make good friends with other shoppers all around the world of shopping bookmarks? We'll thr truth is, all of them could be the reason. It's difference is to form a community of shoppers who wants to buy and sell their own products.

But what about the other sites that lets shoppers unite in one place? Places like eBay and Amazon are for bidding who will be the winner of that item base on the price they want. Shopping forums may also be a good source when they want to buy and sell their own products, especially shopping blogs. They can do SEO there if they want. But through shopping bookmarks, one place not you could share and express what the products you want to buy and sell, but also SEO is a part of it.