dusky - 8:28 am on Oct 12, 2008 (gmt 0) [edited by: Receptional_Andy at 5:04 pm (utc) on Oct. 12, 2008]
The only quick thought I have in mind as to where they are getting the extra information, such as date of posts and authors etc on forums is from forum's RSS feeds submitted through WMT as sitemaps, example [snip], though there is no author info here, some other sites do include the author and perhaps more. It does make sense and is indeed useful.
[edit reason] No specific sites, please [/edit]
[edited by: Receptional_Andy at 5:04 pm (utc) on Oct. 12, 2008]