If you are into, for example, Taiwanese Holo which is called Tâi-gí or Taiwanese Hakka, they also do own clusters and maybe your friend in Kaohsiung will meet people who speak Tâi-gí or Hakka. If you are looking to English speakers, they are also a cluster. Actually, the Forumosa forum talks endlessly about this, so you can find that information there too.