I found this talk interesting. Mr. Lubin outlines many different areas of development and some of the core philosophical ideas around Blockchain applications.
I am particularly interested in the whole idea of identity on the public blockchains. The idea that we can develop systems that allow people to have agency over their information can create some very powerful effects in our networked society. Much of the information we leave over the Internet today we do not have agency over. Other businesses use our data, which we provide for free, in exchange for use of their platforms. I've always visualized this as striking oil... where our data is the oil, which we are providing for free. If ideas such as attention/data markets are built on top of our self-sovereign identities then individuals can generate income ways we haven't even imagined yet!
It is also clear that we have a long way to go. As the interviewer expressed, the usability of much of these applications is far from ideal right now.
Some links from the talk that stood out to me:
https://identity.foundation/ - Foundation developing working groups and standards around decentralized identities.
https://www.uport.me/ - Implementation of some of the ideas behind a decentralized identity.
https://medium.com/uport/the-basics-of-decentralized-identity-d1ff01f15df1 - A solid post explaining identity on the blockchain in more detail.
https://civil.co/ - A platform around building a new ecosystem around journalism. I want to dive into this a bit more.