There's also very little consequence for blowing things up into bigger / click-bait style headlining.
If community is bouncing ideas around, thoughts, etc, then that is much harder online.
I've found getting off social media helps HUGELY in naturally helping get other communities going.
At a real life event they would quickly be seen as a know it all and too domineering, and taken down a few notches. But online they grow a “community”. It’s not all bad, and they share some good thoughts, but it is very different, for better or for worse.
It's great when you just want to talk about that one thing, but I don't think it's a great way to make friends.
Twitter is interesting to me because it's a network rather than a community, but there often seems to be a weird power dynamic between people which would also stifle friendships.
In both online and offline communities you can partially mitigate this issue by employing people to be full-time caretakers of the community.
Even if the most determined to cheat people are highly active, I don't think most of the highly active posters are determined to cheat. I think cheaters are a tiny proportion of users.
If people keep creating new accounts, they can't gain any reputation or other social linkages. No karma, no name recognition, nobody knows it's the same person. No continuity, not even a conversation.
Even if new accounts are easy to make, I think that would be unattractive to most people, who are simply participating and happen to post more than others, not being malicious or trying to cheat in any way.
For the few trolls, and advertisers trying to subvert the feed, a different mechanism is needed to keep those down to a manageable level, as has always been the case.
The problem with the public communities is that it doesn't take long before they're dominated by those who have the most free time on their hands. Free time to post, free time to respond, free time to upvote/downvote and direct the discussion. Generally speaking, the people who have the most free time to be online all day, every day are not the same people who are out there getting things done, doing interesting work, and otherwise having a good time in the real world. That's fine if you're looking to waste time clicking around on Reddit or Twitter, but it's not often conducive to forming real friendships, relationships, or communities. Obviously there are exceptions, but the more public and noisy the community, the more time you have to invest to filter through to the weak signal in all of that noise.