Hey Siqi. Yeah, I don't have a clear idea of how these two models relate to the things one would typically measure in "the industry." That's one thing I'm try

Hey Siqi. Yeah, I don't have a clear idea of how these two models relate to the things one would typically measure in "the industry." That's one thing I'm trying to figure out because I believe fields like SNA, sociophysics, complex systems, etc. can help us understand how to build better, more interesting, and more sustainable social networks -- but AFAIK there's no communication between the people forging new social networks and the people researching them. But I do know this: Facebook has focused on density from very early on, which is a key factor in the threshold model. Their strategy has always been depth first, as opposed to many FB apps, which I think are breadth first. That is, they go viral, but they spread far and wide without spending time building sufficient density to become self-sustainable. There's some formula like engagement = density*activity buried in there that I can't quite pull out.