I think in the near term it would be used mostly for targeted polictical mailing lists. Music mailing lists are probably available and good correlations would seem to make sense since music is often about joining a certain culture.

I’d actually be surprised if it was used much for detecting ‘suspicious behavior.’ It seems like something ‘They’ would use for normalization–mainstreaming apolitical messages and diluting any political styles with apolitical versions of the same. It’s easy to see in hip-hop’s evolution; also maybe punk.