Facebook Depreciates Hashtag Topics in Groups

Hashtags have always been a habitual element on Twitter and Instagram, but have never really caught on on Facebook. You can still use hashtags on Facebook, but not in Groups. Also, due to privacy restrictions, reach limits, and various other factors, they’re just not as effective as a discovery tool.
In terms of general advice, as to whether marketers should use hashtags on Facebook or not, there’s no definitive evidence which suggests that they drive any reach boost in the app.