Welcome to Panic n' Poke!
  Panic N Poke is a mass-message service that allows you to contact your friends and family in an emergency, or just for fun, all with the touch of one button  
When to Panic

In situations when you feel your personal safety is at risk, the Panic button is your solution for getting help. Panic sends a message to your predetermined list of contacts which you can set up individually or pull from your iPhone or iPod phonebook.
When to Poke

Sometimes you just want to send out a fun message and it's not an emergency - that's what Poke is for. For each Poke, you can specify recipients individually. Poke is for fun, not emergencies!