Focused crawls are collections of frequently-updated webcrawl data from narrow (as opposed to broad or wide) web crawls, often focused on a single domain or subdomain.
The Wayback Machine - https://waybackassets.bk21.net/20130606060012/http://support.twitter.com/groups/31-twitter-basics/topics/107-my-profile-account-settings/articles/119137-how-to-change-language-settings