Twitter today announced an update to its iPhone and Android apps that lets you tag up to ten people in any photo you post. In addition to that, the update also allows you to upload up to four photos at once.

Once you’ve attached a photo, a new “Who’s in this photo?” button appears in the tweet compose screen. If you choose to tag friends, their Twitter handles won’t take up space inside your tweet, affording you more space to caption the photo. You can customize notifications and privacy options for who can tag you within the Settings page in the app or on the Web.

Twitter is all about  here and now, so it’s easy to lose track of quality content over time. Photo tags give the service the ability to index photos by person. The company already gave each user profile a prominent photo gallery showing recent media uploads; perhaps next they’ll add a “Photos of me” tab like Instagram did.