All the time, because it's easier to read.
Only when you want to express anger.
To emphasize a word.
Aren't important, that's what the back and forward buttons on the browser are for.
Are needed on every page for the main parts of the site.
Are only needed on the home/index page.
Navigation links? I thought navigation is what you did on a boat!
To send short, quick messages.
To correspond with people in place of postal mail.
To send lengthy, involved messages.
To forward jokes and cool videos to everyone you know.
Shows how great your taste in music is.
Should never be used.
Should only start with a play button, so people can choose to listen or not.
Adds to your website's impact.
On every page.
Only in the about me/contact info.
Who wants anybody to know their name?
Should be used as much as possible because it's interactive.
Is great for a long intro.
Works well in moderation.
When including a third person(s) in your reply to someone else.
To forward jokes to all those in your address book.
When you run out of room on the To: line.
Is always preferable to using the CC: line.
Is good to use when sending emails to people who don't know each other.
When you're sending funny jokes to your friends.
Is never a good idea.
Actually it doesn't.
As long as I don't sign my name.
So I can write whatever I want without fear of consequences!
I have no idea.
Big Tall Woman.
By the way.