In a world were practically everyone has a device that can record video, anonymity in public is becoming a trickier and trickier thing to pull off. YouTube's new built-in facial blurring feature might not necessarily help you control where your face does and does not appear, but it will help people who have your privacy in mind. With the new feature, all uploaders will have the ability to automatically blur all the faces that appear in a video, a feature that could prove especially helpful for anyone who wants to document an event, but not necessarily what people were involved.
From Wikipedia, Pareidolia "is a psychological phenomenon involving a vague and random stimulus (often an image or sound) being perceived as significant." It commonly occurs as face-like patterns in inanimate objects, fifty instances of which can be seen after the break, so you can start developing empathy for cheese graters and alarm clocks and houses and things.