The official forums has a recruitment channel where people can advertise their communities in the US and EU, and you can find all sorts ranging from parents who play, lore nerds who want to gush over the story, or LGBTQ communities.
Patch 8.0 also added a new feature called Communities. Separate from guilds, these in-game groups can be focused around anything and are a great way to meet like-minded players. The official forums has a recruitment channel where people can advertise their communities in the US and EU, and you can find all sorts ranging from parents who play, lore nerds who want to gush over the story, or LGBTQ communities. These are less popular than when they launched, but still a way to make connections with players who share your interests.