Tag people Identify folks you know ANDROID TIPS
Tagging people in Photos helps you identify who is in the shot (useful if you want to share the photo later).
Mind you, it is only possible to tag people from an album (see ‘Create albums’, right). From the main interface, select the drop-down tab at the top-left corner and choose Albums. Now pick out a photo that contains people and then look at the base for a small tag symbol.
Select this and then tap the corresponding tag next to the person’s face. You can now type in their name and if the contact exists on Google+, they can be selected. Note that once a person is tagged, Google+ will inform that user that they have been tagged.
Source: Android Tips, Tricks, Apps & Hacks Volume 8 © 2014 Imagine Publishing Ltd