Computers require energy both to create and maintain. The Internet could not exist with computers. Thus, the Internet needs energy and that energy has to come from someplace. The more people that get onto the Internet, that own computers or means to logon, increases the demand for energy. Then comes the debate, leave it on or turn it off.
Some computer users leave their computers on all the time.
With the computer on, there's a continual drain of energy into the system. At the same time, to shut down and start a computer up draws far more energy than to leave it on. Obviously, the one that uses less energy is the better option. I know I don't plan on setting up an energy meter next to my computer. The computer is a delicate machine.