There’s more information about people today available then ever before, with most of it coming directly from them. But the more personal and important the information is, the more difficult it is to get it from them. Getting people to like you on Facebook or Twitter is more driven by emotion and impulse. Getting them to divulge personal information addresses their practical side.
from Blogger http://evangelinagius.blogspot.com/2015/01/pamela-prentice-of-sas-on-topic-of.html
Evangelina Gius 