This is a good question. In the past, I used to define it as 100K+ views, which happened a lot since last July. But I redefined it as 20K+ after August 2023. In 2020, 2021, and 2022, we had some stories passing 500K+ views in my publications, but they no longer happen. I am unsure whether this virality happens in other large pubs. I haven't heard from my collaborators. I documented my old definition when I thoroughly analyzed 100+ viral stories in 2021.

https://medium.com/illumination/what-i-learned-by-reviewing-100-viral-articles-in-2021-6871c795e134