It's a bit like Houzz, you just add various items, make collections or sets. It's generally used by home designers
To quote from their site:
"Personalized Shopping
Polyvore simplifies online shopping by bringing together all the stores in one convenient place. Then we curate it all into a personalized boutique just for you, making it even easier to discover and shop for looks you love.
Social Commerce
We’re a social site that drives sales to retailers. Our average basket size across retail partners is over $383, which is higher than other leading social networks combined."
Not sure how well it works for individuals but there are some well known companies that promote their good on there