If you wanna censor something, what do you normally do? Yes, a black box... while in fact this is much cooler and easier ;)
Censorship
Censor your faces like they do in the news sometimes...
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Step 1 Get out a photograph of someone where you can see the face very clear;

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Step 2 Get the Circular Marquee-Tool and draw a shape around the face;

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Step 3 Go to Filter>Pixelate>Mosaïc and choose something around 5-10!
