Netflix
But we don't have the official numbers of how many people are watching it, since Netflix is notoriously secretive about its data.
Thankfully, we have an estimate from a startup called SymphonyAM.
Earlier this year, NBC kicked off a firestorm when its head of research claimed that SymphonyAM had uncovered the secret of how many people were actually watching Netflix. Netflix fired back, calling the data "remarkably inaccurate" and taking shots at NBC's own low ratings.
But since then, SymphonyAM has continued to track Netflix shows - for a full explanation of how, see our interview with its CEO. And now the company has provided Business Insider with a list of Netflix's top recent releases, judged by how many adults watched them in the first 35 days ("live + 35").
"Stranger Things" ranked third behind only the lastest season of "Orange is The New Black" and "Fuller House," the "Full House" reboot.
Here is the full list, along with critics data from Metacritic: