Police say that America's most dangerous gangs are increasingly turning to Twitter as a communication tool for their criminal networks. We investigated the Twitter accounts of five notorious sets; the results may alarm you.

The BloodsTwitter.com/Bloods

The CripsTwitter.com/Crips

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The DisciplesTwitter.com/disciples

The Flying Dragons—Twitter.com/Dragons

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Dominicans Don't PlayTwitter.com/ddp