My personal experience does not match that. There was a time (2010-2012 or so where I used to live) when communities were migrating from older "forums" to new and shiny "social networks" - and inevitably ceasing to be communities.
One of these communities was niche enough (and I was involved enough) for me to personally knew all the regulars - they are mostly still online and still care about that thing which brought us together, but there's no meeting place for us online anymore. Facebook groups and Twitter wars do not facilitate meaningful discussion, and the old forum... "Who uses forums nowadays anyway? We have FB and Instagram and stuff", I hear from them, but I believe they're deeply mistaken and it's the other way around. FB has them, and it kinda took them away from me.
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