Today, Instagram announces a people tagging feature that is similar to Facebook tagging. It is called “Photos of You”. You are now able to tag your friends in the Instagram pictures or be tagged by them.
Here is a video of this Photos of You feature.
Worry that you might not like the pictures that someone tagged you? There is a setting for you to approve each pictures.
As of this writing, I have yet to get updated to Instagram version 3.5 that has this feature. In the Instagram blog, it states that it has rolled out the update (to version 3.5) for both the iOS and Android.