Which social media platform's logo is a white 'P' on a red circle?

Pinterest is the social media platform identified by its stylized white “P” set against a red circular badge.

The letter is designed to resemble a pushpin, matching the service’s central idea: saving or “pinning” images, links, recipes, products, and other discoveries to themed boards. The red badge is the most familiar app icon, while Pinterest also uses a wordmark and other brand treatments across its website and products.

Pinterest grew out of Tote, an earlier shopping-oriented application developed by Ben Silbermann and Paul Sciarra. Users of Tote began collecting favorite items, and that behavior helped inspire Pinterest’s visual pinboard model. The service’s prototype launched in 2010 after development began in 2009.

A common mistake is to treat Pinterest as only a photo-sharing site. Its boards and Pins also support visual search, shopping discovery, recipes, home projects, fashion, and ideas. The “P” is therefore both a lettermark and a visual reference to a physical pin.