To be honest, I don't really think there's much value in social networks for humanity. In theory, they can do something good and some people see only positive effects, but it seems that the combination of pseudo-anonymity with algorithms inevitably brings out the worst in people.
Although I’d probably agree. Even tightly moderated communities who fancy themselves as “intellectual” and “rational” like this one are prone to bizarre group-think and emotional manipulation.
But that’s also just humans in general. What you might call bringing out “the worst” in people, might actually be the best we can do given our biology.