On the Internet, nobody knows you're a dog
"On the Internet, nobody knows you're a dog" is an adage and Internet meme about Internet anonymity which began as a caption to a cartoon drawn by Peter Steiner, published in the July 5, 1993, issue of the American magazine The New Yorker. The words are those of a large dog sitting on a chair at a desk, with a paw on the keyboard of the computer, speaking to a smaller dog sitting on the floor nearby.
Source: Wikipedia — On the Internet, nobody knows you're a dog (CC BY-SA 4.0)