Is there a way to check how many users (or even maybe who) is following a certain hashtag on our 2013 on-premise farm?
Specifically I am referring to the tags used within conversations on the Newsfeed.
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I would try building something with the Search Rest API, although there may be a more suitable alternative, but hopefully this helps.
/_api/search/query?querytext='HASHTAG* + path:https://sitecollectionurl/*'&selectproperties='User_Name'
You could start by looking through the Social REST API docs.