I don’t think you need an explicit decentralized solution. I think the individual incentives are such that this type of scam is unlikely, because it’s probably

I don’t think you need an explicit decentralized solution. I think the individual incentives are such that this type of scam is unlikely, because it’s probably prohibitively difficult to maintain two significant non-overlapping social graphs. I explained this more in this comment: https://news.ycombinator.com/item?id=15898504 https://news.ycombinator.com/item?id=15898504