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Slack Is Basically Facebook Now
(www.theatlantic.com)
This is a most excellent place for technology news and articles.
You're really stretching the meaning of "social network" there. May as well say the postal system is a social network.
its used by people socially, so yes, i think the post office counts as a social network... literally
Newspapers had those things where you could chat by sending in mail and having a nickname and shit.