Google uses Googleusercontent.com for much of their hosted content. A user can see this domain as a traffic source in reporting for several reasons:
- Cached pages: Google's spiders constantly crawl the web and save web pages in the case they are taken offline or otherwise unavailable. These cached pages are available next to all search results by clicking the "Cached" link from one of Google's search result pages. When a user clicks this link then looks at the original content on your site, googleusercontent.com is listed as their referring domain. These pages have the subdomain webcache.googleusercontent.com.
- Translated pages: Google offers a robust and convenient translation service. When viewing a site using this service, it originates from googleusercontent.com. Traffic Sources reports populate the referrer from this domain if the user clicks a link to return to the original content. These pages have the subdomain translate.googleusercontent.com.