Isn't it probable that this forum is a prime target for Big Brother to create detailed profiles of us based on our posts?
But I think most people overestimate how interesting they are. Hacker News is one forum on the Internet among literally millions. There are millions of other people who are also social libertarians, and millions of people worried about eroding digital rights. These characteristics do not make you interesting. Hell, digital rights in general are not that interesting to people in Washington - for the most part, our legislators vote the way that whichever lobbyist who last had their ear wants them to, and the American public just gets caught in the crossfire.
The folks that the NSA cares about are those that advocate violent overthrow of governments, or who are a credible threat to U.S. interests abroad. Hacker News readers, by and large, are not a credible threat; we talk, but few of us will get off our butts and do. And so we're just not important enough for the NSA to care.
I know for a fact many NSA employees read and enjoy participating on HN.
There's a few Palantir[0] employees here too, Palantir being one of the many tentacles of the NSA. Infact any contractor who does work for the NSA can be found lurking moar on HackerNews. If you do enough digging around you will find them. Palantir being the more obvious example.
Gosh, thank you. I feel people here feel professionally more important than they actually are. I mean I am sure a forum of Lawyers, Physicists, Surgeons, Truck Drivers would feel just about the same.
A counterpoint: https://theintercept.com/document/2014/03/20/hunt-sys-admins... (if you have access to other people's communications, or the ability to protect them more or less effectively or cause them to be protected more or less effectively, governments might be interested to the extent that they want to spy on other people)
NB: I know of at least one instance where a Big Social Network company contacted someone less than 24 hours after the person wrote a long technical private message to a collaborator. This doesn't mean the Big Social Network was directly reading their private messages -- the BSN may have just been mining messages for keywords -- but the net effect is the same, they notice and will contact you if what you are working on piques their interest. Not all Big Corps mine private messages in this manner -- Google does not do this AFAIK, beyond the algo that displays Gmail ads.
Maybe the people who randomly message me about my projects months after I've posted them are secretly NSA.
I'd suspect that the NSA would drink from bigger hoses to develop more comprehensive models. Those hoses would probably capture HN readership alongside everything else and like everything the firehose data would be mined and if HN correlated to something then the firehose data might be filtered.
As for detailed profiles, HN might be a data point but Facebook, Google+, Linkedin, etc. probably provide a more comprehensive picture (including pictures). In terms of browsing behavior, the NSA operates at the tapping the internet backbone scale.
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I suspect that a fair number of governmental and non-governmental agencies are interested in HN in terms of sentiment analysis and sentiment construction. Ignoring it would be unprofessional. Even amateurs will create sock puppet accounts to promote their business, personal, and political agendas. Small businesses from around the world will post material in their own interests. Mega-companies will post their blog updates here.