The purpose of pinning content to a Pinterest board is to remember it. This makes the content far less ephemeral than feed-based social media channels such as Twitter, LinkedIn and Facebook. In fact, the lifespan of the average Pin is a few thousand times greater than that of a Facebook post.
Pinterest is also a more e-commerce friendly channel than other social networks. More than 90% of pinners have used the channel to plan, research or make purchases. For B2C companies that sell physical products, Pinterest is basically a second online store. For B2B marketers, Pinterest has value as a way to visually promote content.
Pinterest is also unique in that it is as much a search engine network as it is a social media platform. Much like a Google image search, the content is all visual, while keywords used in titles and board descriptions, Pins and images help influence which content will populate the search results.