What are Private Audiences
You can target your campaign to an Audience you own, using any of the following identifiers:
IDFA: Identifier for advertisers for iOS
GAID: Google Advertising ID
IP Addresses: These will only be used for targeting when users connect via WiFi, not 3G.
Universal IDs: Like RampID or mediasmartID
Create, Use or Enrich Private Audiences
Here are the ways to create private audiences, use your own audiences in mediasmart or enrich your audience: