[android-developers] Need architecture guidance in reference to a social app

i need to know how an actual developer might solve this problem .

I have the app on my device and so do you.
In the app i write a message and this message is passed to your app .
You open and your app are notified a new message awaits.
The action you take in reference to this message generates a
notification to me and an update to facebook.
This action also generates a date and time that will populate another
activity on your app and mine.

I am thinking sqllite running off the sd on each device

Question: How do i handle the exchange between the two devices.
Am i going to need a server to accomplish this?

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