Subjects
| Tag | Number of Entries |
| Aliens | 54 |
| Apocalyptic | 3 |
| Comics | 14 |
| Communications | 30 |
| Demonyms | 90 |
| Dimensions | 30 |
| Doctor Who | 11 |
| Drugs | 9 |
| Dystopia | 9 |
| FTL | 51 |
| Gaming | 6 |
| Genre | 75 |
| Language | 42 |
| Paranormal | 35 |
| Propulsion | 28 |
| Robotics | 37 |
| SF Criticism | 232 |
| SF Fandom | 143 |
| Star Trek | 31 |
| Star Wars | 11 |
| Time Travel | 57 |
| Vehicles | 73 |
| Weaponry | 50 |