Polyvore-files will have access to a data feed of YSL's Edition 24 products and YSL accessories to collage with or "make sets" as they say in Polyvore lingo. YSL and Polyvore are also challenging users to create the best YSL "set" and the winner will receive a YSL bag. So start e-scrap-booking people.
More notably, this is the first time we've seen Polyvore, essentially a democratically curated e-commerce site, expand and collaborate with other brands beyond their standard partnerships with e-commerce sites they feature. Polyvore is already a powerhouse online, and unique in what they offer--users can create their own sets, or magazine tear sheets, from a selection of merch drawn from numerous e-commerce sites, driving traffic and shoppers back to those sites. And for Polyvore to partner first with a brand like YSL looks very promising indeed.