  Identity spans multiple dimensions; however, the relative salience of a
dimension of identity can vary markedly from person to person. Furthermore,
there is often a difference between one's internal identity (how salient
different aspects of one's identity are to oneself) and external identity (how
salient different aspects are to the external world). We attempt to capture the
internal and external saliences of different dimensions of identity for
influential users ("influencers") on Twitter using the follow graph. We
consider an influencer's "ego-centric" profile, which is determined by their
personal following patterns and is largely in their direct control, and their
"audience-centric" profile, which is determined by the following patterns of
their audience and is outside of their direct control. Using these following
patterns we calculate a corresponding salience metric that quantifies how
important a certain dimension of identity is to an individual. We find that
relative to their audiences, influencers exhibit more salience in race in their
ego-centric profiles and less in religion and politics. One practical
application of these findings is to identify "bridging" influencers that can
connect their sizeable audiences to people from traditionally underheard
communities. This could potentially increase the diversity of views audiences
are exposed to through a trusted conduit (i.e. an influencer they already
follow) and may lead to a greater voice for influencers from communities of
color or women.
