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Re:Inside Tumblr’s teen suicide epidemic by xtrumanx on Tuesday February 24, 2015 @10:52PM (#9105193)
Reddit and HN allows a great way to express your disapproval. I don't believe people change their opinions because of it. They either decide to shut up about their opinions which they know will attract downvotes or they move on.

I employ each tactic on HN and reddit respectively.

Re:Inside Tumblr’s teen suicide epidemic by striking on Wednesday February 25, 2015 @08:56PM (#9110897)
I know that I personally have changed my opinion because of downvotes and discussion on HN. I can't say that about every single person who uses HN, but it's far better than what I've seen on Tumblr.