Here's how the audiences are defined:

Direct
When a reader navigates to a site by typing in the url into the address bar.

Social
When a reader navigates from one of these sites:

- Facebook

- Twitter

- Google+

- Pinterest

- LinkedIn

- Me2day


Search
When a reader navigates from one of these sites:

- Google

- Bing

- Yahoo

- Baidu

- Yandex

- Naver

- Daum

- Nate


Internal
Internal referrers occur when a reader navigates between two pages of the same domain. Example: http://site.com => http://site.com/about

Link
If there is a referrer present but it's unrecognized by any of those other categories above.

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