Match on what they care about.
Children take a gamified survey in the last week of Year 6, on iPads, in their own primary. No login, no typing. They pick from tiles. About 25 minutes. That's the only thing children ever do inside Tribe.
A matching engine reads the results and groups children across feeder schools around real shared interests. Not popularity, not academics, not appearance.
What the child sees: a question, four tiles, a progress bar. No feed. No friend list. No photos.