| Hashtag | Frequency in past 7 days |
| science | ███████████████████ |
| physics | █████████████████ |
| epshep2021 | ██████████████ |
| olympics | ██████████████ |
| cosmology | ███████████ |
| iteachphysics | █████████ |
| academictwitter | ████████ |
| tokyo2020 | ██████ |
| covid19 | ██████ |
| energy | ██████ |
| scicomm | ██████ |
| arxiv | █████ |
| histstm | ████ |
| photonics | ████ |
| climate | ████ |
| zerocovid | ████ |
| climatechange | ████ |
| climateaction | ████ |
| climatecrisis | ███ |
| climateemergency | ███ |