Historical clue formulations

• They quickly spread online — 2026-06-08
• Oft-reposted internet content — 2026-03-22
• Viral internet jokes — 2025-10-13
• Much social media humor — 2025-05-21
• Riffs on, modernly — 2023-12-22
• Viral jokes like Grumpy Cat and Sad Frog — 2023-08-07
• Much internet humor — 2021-11-09
• Grumpy Cat and Keyboard Cat, for two — 2020-04-21
• Ideas that spread — 2019-03-23
• They might go viral — 2019-01-02
• Ideas spreading virally — 2017-10-29
• Cultural fads — 2015-06-16
• Some modern fads — 2014-08-09