Adobe Audience Manager Usage of Server to Server destination

As I understand from the documentation in AAM Server to Server destination is used as Device Based Segment like Twitter/Facebook Custom Audience/Linkedin Matched Audience and many other Device based Service. But I am not able to understand how it is getting used or what is the final outcome of this. Whether in Twitter there will be ad shown of the product. if yes who will create that ad and where to create this ad and where to store it. Also what will happen when i will send segment to these S2S mention here.Adobe S2S Guide

Regards, Anupam

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