Subjects
| Tag | Number of Entries |
| Aliens | 53 |
| Apocalyptic | 3 |
| Comics | 12 |
| Communications | 29 |
| Demonyms | 82 |
| Dimensions | 29 |
| Doctor Who | 11 |
| Drugs | 6 |
| Dystopia | 9 |
| FTL | 51 |
| Gaming | 6 |
| Genre | 73 |
| Language | 35 |
| Paranormal | 35 |
| Propulsion | 28 |
| Robotics | 35 |
| SF Criticism | 222 |
| SF Fandom | 129 |
| Star Trek | 31 |
| Star Wars | 11 |
| Time Travel | 56 |
| Vehicles | 72 |
| Weaponry | 50 |