But what if the Facebook feed algorithms found that talking about the NSA bums people out, thus decreasing engagement and revenue? They might then decrease the

But what if the Facebook feed algorithms found that talking about the NSA bums people out, thus decreasing engagement and revenue? They might then decrease the visibility of such discussion. What you observe might be a real phenomenon – the 'normals' are barely aware of the NSA stories so far. But something so carefully curated by a for-profit entity as the Facebook feed (or similarly, the national TV networks' nightly half-hour news) is not going to give a representative sampling of people's concerns.