Sure, the main challenge with social graphs is their lack of portability. People call this "network effect" and believe it means that new networks cannot replace large networks...yet over time, they always do seem to get replaced ;)

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Yeah, my friends today aren't the same as when I was at school, but I didn't wake up one day and decide not to talk to my friends and make new ones.

it's also the reason the world has always used a single currency and the next one will be BTC