If you are admin as a brand page, you have probably noticed that your fans aren’t able to tag themselves in photos in your albums. In some cases, people who are both friend’s with the admin’s personal page AND fans of the brand can tag themselves, but the rules are unclear.
UPDATE: That is, until May 12: Facebook Launches Photo Tagging for Pages
From the Hubspot Article: “According to Facebook, only Pages in the Brands & Products or People categories can be tagged in photos at this time.
The Tagging Process:
1. Click the photo you wish to tag and select “Tag This Photo” below the photo.
2. Type the name of the people or product Page you wish to tag.
3. Repeat this process for every Page in the photo that you would like to tag.
4. Click “Done Tagging” in the bottom left corner.”
More details on how from Facebook.