From what I've read, you can know who viewed your stories on facebook. You can see how many times they were viewed and who viewed them. That's different from pictures, videos, and status updates which you don't know anything unless someone interacts with it in some way, such as with a like or comment.
I believe Instagram also works the same way. You can see how many times and who viewed your stories, but you don't know who's just viewing the content in the feed.
But I'm just going off what I've read. I haven't actually created a story and seen what stats are reported.
This is correct.
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