Grab attention with @username, @all, and @here commands

@username

To get the attention of a friend, peer, or colleague in a specific channel, type @ followed by their username, for example: @username. The mentioned user sees the channel name bolded or is notified via email or their mobile device if they're not online.

@here 

You can also notify everyone in a channel who is online by typing @here. This command sends every active user online a DM to go along with the notification. @here's are great for spontaneous questions and bringing in everyone online to one place.

@all

You can also notify everyone in a channel by typing @all. This command sends everyone in the channel an email to go along with the Community message. We recommend using @all sparingly.

Although notifying everyone in the channel is useful for announcements, gathering information, or office hours, not every message requires this.