Twitter today announced an update to its iPhone and Android apps that lets you tag up to ten people in any photo you post. Additionally, the update also lets you upload up to four photos at once.
To help you tag people in photos you upload, a new "Who's in this photo?" button appears in the tweet compose screen once you've attached a picture. 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're posting. You can customize notifications and privacy options for who can tag you inside the Settings page in the app or on the web.