You may please refer to this article https://marketing.adobe.com/resources/help/en_US/social/t_an_posts.html on Post Analytics to view the post statistics/metrics across all Facebook pages, Google+ pages, and Twitter accounts in your Adobe Social account. You could also drill down to view statistics/metrics for the individual Facebook posts, Google+ posts, and tweets (including Reach,Clicks,Interactions and Engagement etc).
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This documentation was very helpful. I can see our Campaigns under the Tag filter in Post Analytics. Downloading the information for each post associated with a Campaign allows us to aggregate the information for Reach and Engagement.