I know what stories are on the other apps... I don't know what this is: it sort of looks like it might be a library I can put on my website to make something that looks like stories, but it also sounds like it is on Google's website? Some people are saying it isn't on the website but is actually on the new tab page of Chrome? I'm seeing people say it involves AMP somehow?

Google should have 1) showed the context in which these show up and then 2) showed a snippet of code or metadata or whatever it was that made it work for some particular site, and then I feel like I would have gotten it; instead they threw up some marketing site that fails to answer even basic questions about what they are doing :/.