We are all much braver on the internet than in real life. People are more willing to engage in activities on the internet they would in real life.
Real life – people are less confrontational and generally have higher tact and social skills, though courage is less.
Over the phone – less tact though slightly more courage.
Email – similar to over the phone, though less tact and more courage again
In blogs and comments, social media – massive drop in tact, large increase in courage.
The web offers equal visibility to opinions of varying validity. There is a general correlation between low validity and low visibility, and high validity and high visibility. This is quite different for blogs and comments, where there are many outliers.