self promotion

People tend to spice up their day by picturing themselves as glamorous as possible on Blogs and FB... the real purpose?

I am not really sure about that but as far I can know self-over-valuation or better known as self promotion is like a stimulus injection done by the government during economic recession . And the real purpose is to portray a certain entity as not having any problem or dilemma though in fact things may be worse than seen .
Why? in economic context if this method is not done, investors may run away from the nation due to the obvious economic problem. In Psychological context, if this method is not done, people and friend may go away from us.. because of the sudden negative change on our behavior...