An intentional tort does not depend on carelessness. It depends on choosing to do the act. The question is not "Was he careful enough?" but "Did he deliberately do this?"
Examples to know:
Libel: a false and unprivileged publication by writing, printing, picture or other fixed representation to the eye that, among other things, tends to injure a person in his or her occupation (California Civil Code §45). A written website post counts.
Slander: the same kind of false statement, orally uttered (Civil Code §46).
False arrest (false imprisonment): confining someone without legal cause.
Battery: deliberately striking someone.
Memory trick: libel is lasting (written down); slander is spoken.
Compare negligence: a driver who rear-ends a car while glancing at a phone did not choose to cause the crash. That is carelessness, so it is negligence, not an intentional tort.