The 'read later' app makes most of its money through selling advertising, subscriptions, and the paid version of its apps, but its margins are likely slim.

It's not immediately obvious what Pinterest would want with Instapaper. The majority of the Instapaper team is relocating to San Francisco from New York, including CEO Brian Donohue and community manager Rodion Gusev. Instapaper will remain a separate app, and Pinterest will invest in the app's further development. The terms of the deal have not been disclosed, but Pinterest has confirmed that it has also bought out the majority stake seed-stage VC firm Betaworks has held in Instapaper since 2013, and now owns the entire company. The San Francisco-based company has agreed to acquire the team and technology behind Instapaper, a tool that helps you save webpages for later reading. Now, Pinterest is doubling down on this idea with its acquisition of Instapaper, an app that's all about what you aspire to read.

Maybe you hope to be a more stylish dresser, or decorate a cozier home. The service lets you create and share visual bookmarks that reflect a certain intention.

Pinterest app open