Subjects
| Tag | Number of Entries |
| Aliens | 50 |
| Anime | 3 |
| Apocalyptic | 3 |
| Communications | 27 |
| Demonyms | 75 |
| Dimensions | 27 |
| Doctor Who | 9 |
| Drugs | 5 |
| Dystopia | 9 |
| FTL | 50 |
| Gaming | 3 |
| Genre | 64 |
| Language | 30 |
| Paranormal | 35 |
| Propulsion | 28 |
| Robotics | 35 |
| SF Criticism | 210 |
| SF Fandom | 119 |
| Star Trek | 31 |
| Star Wars | 10 |
| Time Travel | 51 |
| Vehicles | 71 |
| Weaponry | 47 |