Remember everything about a photo by tagging friends involved
Instagram has updated its app to v3.5 today bringing the notable feature of photo tagging to both Android and iOS concurrently. While hashtags have been a staple of posting on Instagram, you can now choose to tag any of your friends in photos as well. After you're done taking, cropping and applying filters to a photo, tapping a tag button lets you select people (or items) in the picture to mark as those people. You can add any of your friends, but also other accounts you follow such as a restaurant or a sports team. Only the person who took the photo can tag others, which helps keep spam down considerably.
On the other side, if someone tags you in a photo it will now show up in your profile as "Photos of You" for you -- or anyone else -- to see all in one place. If you would prefer to review each tag before it is posted publicly, you can change your settings to prevent unwanted tags. The update is now live in the Play Store, so go grab your download from the link at the top of this post.