Looking at Google Ngram, the term 'manufactured outrage' is one that has evolved with the internet -- as internet usage has become more common, the concept has reached new heights of usage.
And in reality, this is part of what we have to accept with a 'free internet,' where information that fits our existing biases, appalls our sensibilities or morals, or fills our gaps of knowledge or awareness abounds instantaneously accessed through even our smallest of technological devices at a moment's notice.