People don't have to leave the comfort of their desk to get anything. People can buy groceries, makeup, clothes, movies and posters online. There are also giant libraries filled with enough porn to satisfy any man's fantasies. Within a few mouse clicks, the Internet has obliterated the need for grocery stores, electronics stores and even the need for a sexual companion. Your Internet browser will keep you away from those big mean bullies.
Social interaction takes a lot of hard work.
It's difficult to act like I care when I really don't give a damn what the other person is saying. It's hard to meet people. In order for me to start a conversation with someone, I have to be willing to stick my foot out and take the chance of it getting stepped on. I have to take chances every day in the terrifying mass of people. I suppose if I were one of those people who's afraid of making of making an ass out of myself, the Internet would be fundamental to my social life.