The site/app:Poshmark

The gist: This site puts the power in the sellers’ hands by allowing them to curate their closet of items they’d like to resell, upload their own photos, set

their own prices, and accept their own negotiated offers. Buyers also have endless options when it comes to perusing preloved pieces—both luxury and everyday—though an easy-to-use app.

Hottest brands: Nike, Lululemon, Michael Kors, Kate Spade New York, J.Crew, and Tory Burch

Must-know info for sellers: Download the app, and start taking your images. Poshmark tells us that a cover image for your product is important for a listing. Also keep in mind that shoppers need to provide a product description for their listing and, in order to promote sales, share their listings with their followers and to the Poshmark community at large. Once a sale is made, Poshmark will send you a prepaid label to easily ship out your item, and payment will be transferred to your account once the purchase is received by a buyer.

Must-know info for buyers: Poshmark truly runs the gamut from fast fashion to quality luxury items to sold-out gems that are practically impossible to find elsewhere. And for those who are a fan of the haggle, shoppers can make offers to sellers for a better price. Of course, it’s up to the seller if they want to accept.

The X factor: It’s really the social element of Poshmark that sets it apart from other resale sites. “Poshmark is a social platform by nature, and being successful on the app means being social, too, by engaging with other Poshers through likes, comments, and shares, just like any social network such as Instagram,” the brand told us in a statement. One of the unique ways the site taps into this community is through Posh Parties, which happen regularly and come with a designated theme, such as Wardrobe Goals Party or Best in Jeans Party.