Tropo is an application that helps you add SMS, Twitter or IM to your site. It´s a simple API that adds social features to your site or application.
Venture Slogan: Tropo.
Tropo’s own description: “…Add Voice, SMS, Twitter, and IM to Your Applications. Tropo is a powerful yet simple API that adds Voice, SMS, Twitter, and IM support to the programming languages you already know…”
“…Tropo makes it simple to build phone, SMS and Instant messaging applications. You use the web technologies you already know and Tropo’s powerful cloud API to bring real-time communications to your apps…”
Venture Link: tropo.com