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I am old enough to remember when Linux was not yet common.
(I started using Linux back in 1996. And have been using some distro of Linux since then.)
Back then, Linux User Groups (LUGs) got created in different cities by regular people who were enthusiastic abut Linux — to provide help, support, and community for those who were interested in Linux.
(I used to be an active member of VanLUG — the Vancouver Linux User Group.)