You need to know their Profile ID. If you go to their profile page you will see it in the URL. Look for the part in the web address that contains the following:
id=
An example:
m.facebook.com/profile.php?id=XYZ
If they have a custom name, then go to http://graph.facebook.com/username replacing username with their custom name. It will return something like this:
{
"id": "XYZ",
"name": "Pobody Nerfect",
"first_name": "Pobody",
"last_name": "Nerfect",
"username": "username",
"gender": "asexual",
"locale": "en_GB"
}
Remember the user profile ID (XYZ in the examples) and use the following to tag them via the mobile site:
@[XYZ:0]
You can replace the zero with the name you want to show up in the post.
Found via: Tag Friends or Pages from Facebook Mobile Version!
