This analysis from Ben Thompson (Stratechery[1]) just yesterday would be a great place to start:
"Imagine a Twitter app that, instead of a generic Moment that is little more than Twitter’s version of a thousand re-blogs, let you replay your Twitter stream from any particular moment in time. Miss the Oscars gaffe? Not only can you watch the video, you can read the reactions as they happen, from the people you actually care enough to follow. Or maybe see the reactions through someone else’s eyes: choose any other user on Twitter, and see what they saw as the gaffe happened.
What is so powerful about this seemingly simple feature is that it would commoditize “live” in a way that is only possibly digitally, and that would uniquely benefit the company: now the experience of “live” (except for the shock value) would be available at any time, from any perspective, and only on Twitter. That such a feature does not exist — indeed, that the company’s stated goal is to become more like old media, instead of uniquely leveraging digital — is as good an explanation for why the company has foundered as any."
It may sound egotistic, but it's also a solid way to build something akin to a 'book' albeit in a discrete blogged form: you tend to quote yourself not to make the same point over and over again in so many different phrasings. It makes the arguments consistent, and rewards thoroughness, paying attention to each post (coherency, wording, etc.) Eventually it builds up a coherent, cohesive corpus of ideas that hopefully, should the theme be well-defined, is a book.
Usually when going for publication, you'd replace these quotes with references to previous chapters, typically in footnotes.
"Imagine a Twitter app that, instead of a generic Moment that is little more than Twitter’s version of a thousand re-blogs, let you replay your Twitter stream from any particular moment in time. Miss the Oscars gaffe? Not only can you watch the video, you can read the reactions as they happen, from the people you actually care enough to follow. Or maybe see the reactions through someone else’s eyes: choose any other user on Twitter, and see what they saw as the gaffe happened.
What is so powerful about this seemingly simple feature is that it would commoditize “live” in a way that is only possibly digitally, and that would uniquely benefit the company: now the experience of “live” (except for the shock value) would be available at any time, from any perspective, and only on Twitter. That such a feature does not exist — indeed, that the company’s stated goal is to become more like old media, instead of uniquely leveraging digital — is as good an explanation for why the company has foundered as any."
[1] https://stratechery.com/2017/twitter-live-and-luck/