https://thenextweb.com/syndication/2020/05/24/research-political-hashtags-make-online-news-discussions-more-extreme/

Whether you’re a conservative or a liberal, you have most likely come across a political hashtag in an article, a tweet or a personal story shared on Facebook.

A hashtag is a functional tag widely used in search engines and social networking services that allow people to search for content that falls under the word or phrase, followed by the # sign.