You can make the case that slacktivism is important because it makes people feel affiliated to a movement and be part of it, and talk about it.
I can imagine Iceland becoming a good place to run a controversial Web site. But... Iceland may find itself forced to defend controversial speech.
Engineering serendipity is this idea that we can help people come across unexpected but helpful connections at a better than random rate. And in some ways it's based on trying to reassess this notion of serendipitous as lucky - to think of serendipitous as smart.
A world where everyone creates content gets confusing pretty quickly without a good search engine.
If I use Facebook to stay in touch with my high school friends who are church-going Republicans, I may be getting more ideological diversity than in hanging out with secular progressives on the World Politics sub-reddit.
Reddit names are unconnected to real-world identities and it's commonplace for users to create 'throwaway' accounts to reveal sensitive information.
