I'm not Zooming, but everyone I know is, and it looks pretty damn slick and seems to work great. I can't think of any service that has had as fast and huge an adoption, which is obviously due to blind luck/things beyond their control (no one saw global apocalypse coming and hoping for such would be a horrible business plan).

Of course there's been other services working just as well or better for at least 10 years now. Interesting things converged suddenly on Zoom. I guess full cross-platform support was the key? Also interesting is the deluge of anti-zoom articles that are blanketing the cybersphere :-) just as they are getting traction. Jealous rivals? Disgruntled lovers?