Preliminary research shows the human brain can only maintain about 150 connections on social networks. See what they say at TimesOnline, CNN, PBS, FOX, Times of India, Social Media Today, PHYSORG.com
■Class discussion: How many friends do you have on Facebook? How many do you really "talk" to regularly? Do you feel pressure to add more friends? Do you know anyone who has more than 150 connections? Have you ever "unfriended" someone? If so, why?