A person creates a group album by uploading some of their photos around a certain topic. Then, they invite the people who care about that topic to join the group album. Only those who are invited will be able to view, like and comment on all the photos in that space, as well as add their own photos and videos to it. What you post in the app is completely private, except to those you invite to the group album, so you don't have to worry about who is looking at your content.
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