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.
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.
When you've got 5 minutes to fill, Twitter is a great way to fill 35 minutes.
Make your links from blog comments genuine.
We want people doing white hat search engine optimization (or even no search engine optimization at all) to be free to focus on creating amazing, compelling web sites. As always, we’ll keep our ears open for feedback on ways to iterate and improve our ranking algorithms toward that goal.