Twilio has been leading the communication space. Their value proposition has always been making it dead easy for developers to build Voice & SMS apps.
Today, they are making it even easier by introducing Twilio Connect. Just like Facebook Connect (also an OAuth login), you can use Twilio Connect to log in a Twilio account, and make phone calls and send SMS via that account. Of course, you charge to that account.
Developers can now build their apps, and let users pay via their own Twilio account. This solve a billing problem to developers.
This sounds like a great feature. However, this also means developers would not be able to markup for the voice minutes and SMS sent from the app. Moreover, Twilio is not doing any revenue share with developers using Twilio Connect.
This is unlike BlueVia Connect, which does revenue sharing.
Find out more about Twilio Connect here: http://www.twilio.com/api/connect