Give away free things and information on your Web site. Reciprocity also applies to concessions that people make to one another. You may reject a large request, but if I retreat to a smaller one, you are now more likely to reciprocate with a concession of your own. Consistency - personal. The desire to be, and to appear consistent.
People are more likely to comply once they've made a public commitment.
The researchers found that by first getting residents to sign a petition, contributions nearly doubled for the handicapped. It's been said that people are sheep as they tend to follow the group. We decide what to do in a situation by looking to what others are doing. If many individuals have decided in favor of a particular idea, we are more likely to follow, because we perceive the idea to be more correct, more valid. Show how popular your site is by displaying your subscribers and unique visitors.