This may be the article I remember--the part towards the end caught my
attention:
"The Dangerous Speech Project has gathered typical hallmarks of speech that
seems to catalyze just such mass violence and has developed guidelines for
analyzing the level of danger posed by a particular turn of phrase: how
likely it is to lead to violence in a specific context. This analysis can
be applied to any form of expression—a drawing, photograph, or film—not
just words.
WHICH WORDS SPARK
One can estimate the likelihood that speech will spark violence in any
given situation using just these five criteria: the speaker, the audience,
the speech itself, the social and historical context, and the means of
dissemination.
In each case, one or more of these criteria may be especially important. A
speaker can have great influence over a particular audience, while certain
audiences may be especially vulnerable, because of economic hardship, fear,
or existing grievances. Certain language-related events—defined broadly to
include such acts of expression as burning a book—can be particularly
powerful. "
source:
http://www.worldpolicy.org/journal/spring2012/words-weapons
There are more links at the bottom of this Berkman Center page:
https://cyber.law.harvard.edu/events/luncheon/2014/03/benesch