The Facebookification of Instagram continues apace. According to Instagram:
When you upload a photo to Instagram, you're now able to add people as easily as you add hashtags. Only you can add people to your photos, so you have control over the images you share. And it doesn't stop at people—you can add any account on Instagram, whether it's your best friend, favorite coffee shop or even that adorable dog you follow.
There will now be a Photos of You section on your profile.
That they're giving this a brand — Photos of You — is important. I suspect they know that if a brand name doesn't catch on, people will think of it and refer to it as what it most obviously is: Facebook tagging.