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 Bloods—Twitter.com/Bloods

The Crips—Twitter.com/Crips

The Disciples—Twitter.com/disciples

The Flying Dragons—Twitter.com/Dragons

Dominicans Don't Play—Twitter.com/ddp