- Limbo: famous people who you follow, but they’re not going to follow you back.
- Lust: discussion of sexual topics.
- Gluttony: discussion of food, recipes, restaurants.
- Greed: people interested in business and finance topics.
- Anger: technology and web sites, and other things that make you rage.
- Heresy: discussion of religion.
- Violence: friends who play video games
- Fraud: political debate.
- Treachery: personal gossip about your social group.
(With thanks to Dante Alighieri and Evan Cordes.)