Farhad Manjoo:

Black people - specifically, young black people - do seem to use Twitter differently from everyone else on the service. They form tighter clusters on the networkthey follow one another more readily, they retweet each other more often, and more of their posts are @-repliesposts directed at other users. It's this behavior, intentional or not, that gives black peopleand in particular, black teenagersthe means to dominate the conversation on Twitter.

Caveats here.

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