  Social movements use social computing systems to complement offline
mobilizations, but prior literature has focused almost exclusively on movement
actors' use of social media. In this paper, we analyze participation and
attention to topics connected with the Black Lives Matter movement in the
English language version of Wikipedia between 2014 and 2016. Our results point
to the use of Wikipedia to (1) intensively document and connect historical and
contemporary events, (2) collaboratively migrate activity to support coverage
of new events, and (3) dynamically re-appraise pre-existing knowledge in the
aftermath of new events. These findings reveal patterns of behavior that
complement theories of collective memory and collective action and help explain
how social computing systems can encode and retrieve knowledge about social
movements as they unfold.
