Facebook App Patent Question?

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I was wondering if I can patent an application designed to be integrated with Facebook if the process is a common process but not yet implemented onto a Facebook app. Outside of Facebook, the process of the application I'm pretty sure cannot be patented since it's somewhat common.

I suppose an analogy may be:
Vanilla Ice Cream itself may not be able to be patented but,
if Vanilla Ice Cream was somehow used with Facebook, can it be patented?
*This is an unreal example.