and here's a post about methodology from one of the models used...
http://wefeelfine.org/methodology.html

Because a high percentage of all blogs are hosted by one of several large blogging companies (Blogger, MySpace, MSN Spaces, LiveJournal, etc), the URL format of many blog posts can be used to extract the username of the post's author. Given the author's username, we can automatically traverse the given blogging site to find that user's profile page. From the profile page, we can often extract the age, gender, country, state, and city of the blog's owner. Given the country, state, and city, we can then retrieve the local weather conditions for that city at the time the post was written. We extract and save as much of this information as we can, along with the post.

This process is repeated automatically every ten minutes, generally identifying and saving between 15,000 and 20,000 feelings per day.

so every ten minutes these guys use computers to 'harvest feelings.' then they make a special map and decide what's the happiest place in the world etc.etc.
i am beginning to think i fell down the rabbit hole with alice.
-pi