You can mention other people in your posts and comments to get their attention. They'll get a push notification, and tapping it takes them straight to the post or comment where you mentioned them.
How to mention someone
While writing a post or comment, type @. A list of people you can mention appears. Keep typing a name to narrow the list, then tap the person you want.
You can mention anyone who can see the post you're writing in, for example other participants in the same challenge. You can also mention a whole team, which notifies everyone on it.
In a team's feed, you can also use @Everyone in a post to notify every member of the team. @Everyone isn't available in comments.
Good to know
Mentioned names appear as links. In a challenge, tapping a name opens that person's profile.
You can also mention people in the note on an activity you log manually.
Mentions arrive as push notifications, so make sure notifications are turned on for Count.It in your phone's settings.

