What's wrong with Stack Exchange? I'm a Math Stack Exchange user and I think it's absolutely amazing for the knowledge seeker. It's a repository of high quality questions and answers that you're not going to answer yourself. You can instantly access hundreds of the smartest people in the world. You can spend a week thinking about something difficult and frequently get it answered in under an hour, sometimes 10 minute…
Also with HN, many subreddits, millions of personal blogs and sites...
I tried to find why the paper says that Wikipedia is "the last good place on the internet", but it doesn't seem to provide any reference for that. Is it a meme somewhere?