Justifying Social Networking

Tyler Cowan of George Mason University and author of "Create Your Own Economy"  has an interesting way to justify usage of FB, Twitter, blogger et al. Transcribed from his podcast at:http://www.econtalk.org/archives/2009/09/cowen_on_cultur.html.
"It is not a waste of time. We are learning from it, becoming more productive, entertaining ourselves, very often giving to the world -  people read you, listen to your podcast, giving and taking is extremely rewarding. Giving is the ultimate human activity which is not a waste of time. Social networking has enabled 100's and millions of people to become givers."
Next time when somebody says it is a waste of time, we all can use this tagline.