Facebook introduces @mentions
Status updates have always been one of the most popular and most used features of Facebook and today's introduction of "friend tagging" in updates is sure to make the it even more popular. Much like Twitter's @reply feature, tagging in Facebook status updates work by adding an @ symbol in front of the name of your friend or family member. Facebook recognizes this and will show you a list of your friends, making finding the right person quick and easy.
A plus to Facebook's version of this feature, is while the @ symbol makes including friends easy, it won't actually be displayed. You'll also soon be able to tag friends in applications as well. Friends you tag in your status updates will get a notification and a wall post linking them to your update. They can also remove the tag if they don't want to be linked.
Like most new Facebook features, most users won't see this right away as they take time rolling out the feature to their millions of users.