Most Helpful Guy
You can mention a user in a question's details, a take's details, an opinion, or a comment by using the @ symbol in front of their username. For example: @GirlsAskGuys
When a user is mentioned, they'll be notified (click Mentions from their profile page). When they check that notification, they'll be taken directly to where they're mentioned on the question/take page.
Please keep in mind that you cannot mention a user who has blocked you, you cannot mention an invalid username, you cannot mention someone if you post anonymously, and you cannot use mentions in question/take titles.0