When you update your profile photos, the changes are reviewed by our tiny team to ensure they meet our Community Guidelines and to ensure people don’t all of a sudden change all their photos to be of someone else (for your safety - we care tremendously! 😊).
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That means there will be a delay between when you upload the photos and when the changes appear for others on your profile. Sometimes it may take us a few days to get through the queue. We are trying to improve this system so changes can be reflected faster. Thank you for your patience!