Social proof is the powerful idea that if we think everyone else is acting in a certain way, we're likely to act that way, too. People are conformists by nature, and we take cues about how to think and what to do from those around us. Social norms fuel entire industries. Would the fashion world be able to motivate us to buy a narrower tie or a longer skirt this year if we didn't care what people think?

At Network for Good, we've tried using the principle of social norms to increase donations through our web site. We state that more than 325,000 people have given more than $137 million through our web site to show new users just how popular we are. In December, when our traffic increases, we feature a real-time ticker of total donations so people can see just how many other people are taking action. In December 2006 and 2005, we partnered with Yahoo! on a "cybergiving week" to promote the idea that just as retail sales has black Friday, charities have "cybergiving week" - that end-of-year spike in online giving. The psychological subtext is simple; everyone's doing it so you should too!

Here are some ways you can generate social proof: