Recently switched over from Windows to Pop_OS! as a daily for the first time, and I am loving every second of it! As a convert from Windows to Linux who also likes to dabble in some advanced stuff, Pop_OS! was very easy to get into. In the past I've tried Arch but it was too much work to get to my liking.
I'm pretty sure AMAs in the past have introduced a lot of people to Reddit (Obama's AMA comes to mind). Before that AMAs were fairly popular too amongst celebrities.