Yes, in many social media platforms, the original creator can often see if their story has been shared. For example, on Instagram, if you share someone's story, there are analytics available to the creator which can show how many times their story has been shared and some basic information about the sharers, although not in a very detailed way. So, generally, there are mechanisms in place for them to have an idea about the sharing of their story.
On some social media platforms, there are features that can give you an indication if your story has been shared. For example, on Instagram, if someone takes a screenshot of your story, you may receive a notification. However, in terms of directly seeing who has shared your story in a traditional sense like forwarding it on other platforms, it's often not possible to know for sure. The platforms are more focused on protecting user privacy in this regard.
In many cases, someone could potentially find out if you shared their story. This could happen through notifications, mutual friends seeing the share, or other tracking mechanisms on the platform.
Often, the person can tell if you shared their story. For example, on Instagram, it might show who has shared their story. But on some less feature-rich platforms, it might not be as straightforward.
Yes, they can. For instance, on Twitter, if you retweet someone's post, the original tweeter can see that their tweet has been retweeted. They can also see some basic stats about the retweets, like how many times it has been retweeted. It's a way for the content creator to gauge the popularity of their post.
Mostly, the answer is no. Social media apps focus more on other aspects of photo engagement such as views, comments, and likes. The idea of sharing is a bit more complex in terms of privacy. If a platform were to show who shared your photo, it could lead to unwanted harassment or privacy breaches for the person who shared it. So, for now, we don't have a way to easily see if someone has shared our photos.