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


Email

When a reader navigates from an email campaign. Note that this is not always guaranteed to be successfully detected.

Other
If there is no referer present, or if there is a referer, but it's unrecognized by any of the categories above.

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