All third-party integration with Pinterest occurs via a Pinterest application, and every application is owned by one and only one Pinterest profile. You could either develop and code your own service to operate your application, or you could use an existing service to act as your agent.
The SocialOomph service is the agent that acts as the operator of your Pinterest application.
This arrangement means you own the Pinterest application that posts to your Pinterest properties, and you use SocialOomph as the software engine to do that posting for you.
It holds the following benefits: