Trumpia is the Ultimate 911 Device for Friends

Here’s how it works: Register for an account and tell it the contact information for your friends. Make sure you enter their instant messaging, cell phone and email contact information for maximum impact. You can then group your friends and message them all at once by texting a message to Trumpia. Your friends receive the message on all of their communication devices at the same (email, SMS, IM), ensuring that there is no way in the world that they can plausibly claim to have missed it. The idea is that a friend may miss an email or instant message, but they sure as hell won’t miss it if you hammer them at every single point of contact that they have.
http://www.techcrunch.com/2007/09/24/how-to-lose-all-your-friends-immediately-in-real-time/

http://www.trumpia.com/