If there is a group photo within their profile, they have to indicate who they are in it. This will require some sort of image processing during the signup process to determine if it is a group photo, and then asking them to click on their face within the photo so that when other people are swiping through their photos, they can tap on the photo to see which one they are.
This makes it easier for people that are swiping to see who a person is in a group photo. This is particularly important in profiles that have almost entirely group photos, and they cannot tell who the profile is for.
If there is a group photo within their profile, they have to indicate who they are in it. This will require some sort of image processing during the signup process to determine if it is a group photo, and then asking them to click on their face within the photo so that when other people are swiping through their photos, they can tap on the photo to see which one they are.
This makes it easier for people that are swiping to see who a person is in a group photo. This is particularly important in profiles that have almost entirely group photos, and they cannot tell who the profile is for.