Let's Talk About...Middle Initials

Ok. Do you use your middle initial? Some people do and some people don't. I can see why you would use it to distinguish yourself from all the other "John Smiths" out there. I can see why you would use it to score an email address that would be otherwise taken. Some people use it out of habit. Others use it to sound important. Some just like the way it sounds. And some people don't have a middle na...