Binary serialization reduced nostr-social-graph filesize by 56%. Public keys, timestamps and small integers (condensed representation of follow relationships).
Probably all socially connected Nostr users and their follow lists fit in under 20 MB. Iris uses the graph for spam filtering, and it works nicely.
Maybe nostr social graph will be used in the future by robots and drones that need to identify each other and know friend from foe.

GitHub
GitHub - mmalmi/nostr-social-graph
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