With increasing number of users or topics that you are following , it will become difficult to check all of them in the enterprise SNS (Task Feed). "Mentions" is how to specify a person whom you want to tell. Enter name of the person after '@'.
"Thanks! Mr.***!", "Mr.***, would you please do this?", to tell something like those, this convenient feature is provided to Tweet to certain person.
When you Tweet in the way explained in "Tweet out Your Situation and Advise to Your Colleagues", enter '@', then enter part of the name of who you want to tell.
List of names which includes those letters you entered will appear. Choose one to specify a person.
Instead of user name, entering part of email address following '@' will show you the list.
Doing so, string of @[*****] is entered in the field.
Enter your Tweet after that and Post it, your Tweet will be told to specified user.
Specified user can check the Mentioned Tweet in the way explained in "To check Task Feed You Are Mentioned"