Not in the USA, no.
https://www.popehat.com/2015/05/19/how-to-spot-and-critique-...
> Certainly online harassment leading to someone committing suicide is.
Harassment can be, but here "harassment" means making threats of violence, not just criticizing someone. That falls under "true threats":
https://mtsu.edu/first-amendment/article/1025/true-threats
Note that the older "fighting words" doctrine is probably obsolete and even then only applies to face-to-face conversation. For more on that see the prior link to Popehat.
Documenting people's lives is not harassment.
To have all of your privacy taken away from you.
The US is rather unique in their absolutist view of free speech and other countries don't work the same way. Generally, for example, this would be a violation of UK law.
Certainly online harassment leading to someone committing suicide is.
KF is a platform that facilitates these activities.