Just a very short message to direct you to my article on statistical significance over on the Kissmetrics blog. The emphasis is on intuitive means to understanding the key ideas.
Check Out My Guide to Statistical Significance on Kissmetrics
Fun, example-filled guide, aimed at building intuition
More Articles: Click here for full archive
The general principles of targeting followed by a tour of the available options on the major platforms
Why Twitter Cards and Facebook Open Graph aren't total wastes of time
The relevant laws, some growth-hackery tips, and suggestions about good emails to send