What Are Examples of Two Sided Market Places?

Two sided market places allow value to be exchanged between two parties that wouldn't be able to exchange that value in the same way or the same scale if you didn't exist. Apple and microsoft both have two sided market places within their business, mainly in the way of their ap stores. Businesses with network effects are generally winner take all markets, which means that finishing second as a two sided market place is generally a recipe for failure.