A WebmasterWorld thread has some savvy webmasters and SEOs asking if Google has changed how they handle the domain clustering in the search results.

Domain clustering is when Google will determine if they want to show one or more search results on a single page from the same site or not. Often, Google likes to “diversify” the search results so that in many cases, Google doesn’t show the same search results from one domain name.

One webmaster wrote:

Forum moderator, Robert, responded:

Google has time and time again tweaked how they do domain clustering in the search results. So Google could have made a tweak recently.

Forum discussion at WebmasterWorld.