Audience size

If you want to see the size of all your audiences you need to go to Audiences; specifically, to the audience dashboard. The third column shows the sizes of the audiences. The audiences are automatically updated from time to time, but you can always be sure and also manually update them.

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The size of an audience is also visible while making a campaign. Just press on Get reach estimate and the number of people reached will be shown. You can always refresh it to see if it's up to date.