Mobile is important, and coming faster than most people in this room realize.
I'm a bit of a connoisseur of Google criticism.
Make your links from blog comments genuine.
Thirty days is just about the right amount of time to add a new habit or subtract a habit - like watching the news - from your life.
Think about what a user is going to type.
The objective is not to "make your links appear natural"; the objective is that your links are natural.