One of the great advances of the digital age is that it allows you to be social and anonymous at the same time. It allows people to be passive in an active way.
You don't actually have to donate money to a cause. Merely color your Facebook photo pink, "like" disaster relief and continue scratching yourself. You look as if you did something.
And why actually play basketball? Instead you can assign yourself an avatar and not only not use no muscles but not even use your imagination.
In other words, you can portray yourself as an Albert Schweitzer with Amare Stoudemire's muscles. But in real life, you're Homer Simpson.