I think the open source aspect of this is irrelevant. I think the question you're asking is why hasn't anyone replaced Facebook with a better alternative AND wh

I think the open source aspect of this is irrelevant. I think the question you're asking is why hasn't anyone replaced Facebook with a better alternative AND why hasn't it caught on. See wt.social for an alternative. Who knows if it'll become popular but I bet it won't be because it's OSS or not... simply because your family and friends don't know what that is or don't care.