Love this pair of observations about how books get judged by their worst parts, but collections of online posts for their best:
Another problem with a book is that it's One Big Thing. Very few book reviews say "Chapter two is a gem, buy the book for this and ignore chapter six, the author is confused." Most just say "He's an idiot, chapter six is proof of that."
...versus...
Thanks to Twitter and Hacker News and whatever else, if you write a good thing, it gets judged on its own. You can write 99 failures but you are judged by your best work, not your worst.
Microcontent (and even decontextualization) for the win.