Hashtags help you group related activity together.
Tash Postolovski
Using Hashtags
Hashtags are similar to hashtags on Twitter. They're a fun and useful way to group activity around a particular topic.
When a colleague clicks on the hashtag, they'll see all other activities under the same hashtag. To add a hashtag to your newsfeed post, chat message, or when commenting on an activity, type '#'. You will then see a list of previously used hashtags. You can select one from the list, or create a new one by typing the hashtag in full.
Browsing Hashtags
When you see a hashtag on Arcade, you can click on it to see all the activity associated with that hashtag.
Browsing hashtags