If there’s one thing the App Store is saturated with, it’s messengers: WhatsApp, of course, but also Facebook’s, and Snapchat, and Hangouts, and Line, and Kik, and all the rest. The answer says a lot about where Pinterest is going — and the product itself is one of the best things we’ve seen from Pinterest to date. In part, Pinterest messages simply close the loop that the company started when they introduced the ability to send pins to your friends on the network last year. Today, Pinterest users send 2 million pins a day on the service.