Silverpop API can send automatic messages via e-mail or RSS using an XML feed. To create Apple apps related to automated marketing messages, developer smitchelus has created a third party Silverpop Engage iOS SDK. In his Github site, he shares a wrapper for the Engage Database XML API and JSON Universal Events. Instructions to install are available. Demo, guides, and tips are accessible as well.
Planspot, event marketing service provider, provides access to its marketing tools through the Planspot API. The Planspot platform offers an all-in-one marketing tool that can manage, promote, and sell tickets to events. From promotion via email and social media, to dashboards that track sales and monitor progress, Planspot embodies its founder's dream: "to create a single solution for event promotion, publishing, discovering and planning."
As a developer, you can figure out how to make your program connect to Facebook, Twitter, SMS, and Email. Or you can use the Embarke API and connect just to Embarke, a messaging platform that connects you to them all. You can skip learning the specifics of how to connect to each of them. The REST API's website has a five minute tutorial video on how to use this gateway to its developer tools for social communications.