I have an app that says: 157,116 Story Impressions. I am wondering if this is how many times it was displayed on a Facebook page. Is this correct?
This Facebook KB article shows what a Story Impression is (emphasis mine):
Impressions are the number of times a post from your Page is displayed, whether the post is clicked or not. People may see multiple impressions of the same post. For example, someone might see a Page update in News Feed once, and then a second time if their friend shares it.