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- Red spiders (1 member)
- Redwall (4 members)
- Regex (7 members)
- Religion (51 members)
- Renewable energy (3 members)
- Rhymes (2 members)
- Rhythm Games (7 members)
- Rickrolling (10 members)
- Robots (41 members)
- Romance (132 members)
- Roomba (11 members)
- Root category (3 members)
- SETI (4 members)
- Sabotage (6 members)
- Sarcasm (18 members)
- Saturday comics (5 members)
- Scale World (3 members)
- Scatter plots (20 members)
- Science (169 members)