This content has been deliberately weaponised. Various interests, some of them hostile, have a stake in promoting it. See e.g.
https://en.wikipedia.org/wiki/Internet_Research_Agency
Of course various US (Chinese, UK, Israeli, Saudi, Indian, Iranian, etc, etc) interests run their own versions, both at home and elsewhere.
And corporate astroturfing is not a new thing.
There's a huge difference between kooks sharing a bit of kookiness with each other, and industrial misinformation campaigns created for political and strategic ends - which may include political destabilisation, radicalisation, and the promotion of extremism and domestic terrorism.
The two phenomena are not even remotely comparable. But at the moment information consumers literally cannot tell them apart, because there is no practical way to do that.
The crucial distinction is between individual freedom of speech, where people with unusual views are allowed to say whatever they want as long they don't incite violence, and industrial misinformation, which is inherently toxic and cannot be excused or justified.
There is no principle that can defend deliberate mass manipulation of the public through lies, exaggeration, and wilfully misleading manipulation.
The challenge is getting that principle enshrined in law. So-called free speech advocates will of course agitate against it, and they will be wrong. Knowingly and deliberately running a campaign to mislead the public should be considered a criminal act with criminal consequences.