Latest questions about "snapchat story"

I read somewhere that you can't know the "+1 more" who viewed your story because that's the whole point of Snapchat.

Someone has seen my Snapchats story, but they are not on my friend list.

I posted my story around 5pm and I add someone around 8pm. Can they still see my story?

I'm confused. I think someone deleted me on Snapchat as in the 'who added me' part their name is not there and I see no bestfriends and have not viewed any of my snap stories.