Social conflict
Proposing that the way the internet promotes social conflict is
through replacement of reciprocal communication (conversation) with
one-to-many communication.
In the age of the printing press, and of broadcast radio and TV, only
a few could communicate their ideas through those; for everyone else,
conversation was their only opportunity.
I am skeptical of her claim that printing, which was a change in a
similar direction, brought about the religious wars in Europe, because
such wars had gone on since centuries before. I recall two previous
series of religious wars, that against the Bogomils (Gnostics)
starting around 1200 and against the Hussites starting around 1400.
In all three cases, it was the official church against another kind of
Christianity.
The Bogomils used hand-copied books to spread their ideas, and I
suppose the Hussites did too. (This information comes from
Wikipedia.)
I think that the blame for those wars falls on the idea that one
doctrine is official, and any other variant is to be stamped out "by
any means necessary." It was the Roman Empire which imposed this.
That doesn't imply her idea is valueless as regards the internet.