Wow. This is a lot to digest. Thanks for the thoughtful comment here! Let me give it a shot though...

I think facebook will survive as a centralized entitiy.

I agree... Unless an even bigger scandal rocks the boat, chances are they will get through this and come out smelling like roses.

Big corporations using data is not a new thing.

This is true as well and will continue to be true as long as they are able to get their hands on it.

So cambridge analytica is not facebook's problem even if the political class wants us to think so.

I can totally see the political spin on this and can't take a story like this at face value but using it as a starting off point to suggest a paradigm shift is just too juicy to ignore!

Lastly, i think blockchain makes transactions immutable. I am not sure if they make user data completely secure. A distributed ledger shared between nodes can be hacked at one of the nodes and data can be leaked (i am not sure if it is impossible or just difficult). please correct me on this if i am wrong.

You are correct about the transactions being immutable (for the most part although there may be some exceptions to this?). Nodes can be hacked but on systems with DPOS a consensus model is usually quite robust so I wouldn't be worried about this potential security risk with the more robust blockchains...

Overall I feel DAO is a superior model of public or corporate governance and with this belief in mind I'll continue to learn and invest in this field. Thanks a lot for your thoughts. Very intelligent opinions and beliefs presented!