Groups chats work as social networks because of social pressure tricks:
• Read receipts
• Displaying "John was online 43m ago"
• Continuous pressure to reply "enough"
• Small chats can have strong norms (no outrage/politics) implicitly enforced per reply
Quick thread 
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yeah def bigger than that. too high-volume for me to keep up with
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Yeah I almost never keep up with those then. After a certain size, it makes sense to graduate from chat to something like a mastodon instance
End of conversation
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