HOW TO TAG A FRIEND/GROUP OR PAGE ON FACEBOOK.

To tag a friend on your facebook status,you have to know the facebook Id/Uid of that person first.
On getting the facebook Id/Uid,just include the following codes in your status update.

@[UID:0]

Replace the UID above with the 15 digits number of the person/group you want to tag.

Example:

@[100023256560456:0]

THAT'S ALL.
For tutorial on how to get facebook Id,visit this post.