As a side note, my company recently had a meeting with execs of our national branch of facebook, and after that meeting about 50% of our execs went and deleted their account...
I am interested, can you please elaborate ? (Feel free to email me - see my profile - if it is sensitive)
The issue was the "product"s (i.e regular people) privacy and the attitude towards them by the local FB management.
Pretty basic.
Some users post contact info in their profile, so there is the possibility for messaging (email). Yes, there are policies, and structure and many good things - I'm not sure that means that HN isn't a social network of sorts?
I suppose it might boil down to a technicality, but I always read "social network" as a graph that describes how a group is connected - not as some strict technological definition. So a bunch of people that informally meet at a cafe to discuss politics, art and other topics can be described as a social network.
Result: more free time to do interesting and productive things and people aren't bothering me as much. I have taken control of my life and I'm not being pushed around to do things based on notifications or desire for artificial status(likes, retweet, stars). Stop using these services that sell your privacy, control your communication, make hostile changes and in the end do not care about you.