Was Digg Used for Stock Manipulation?

There have been three wild stories promoted to Digg's front page recently related to Google's supposed acquisition of Sun. According to Silicon Valley Sleuth, the rumors were baseless and the story promoted using fraudulent means:

Regardless of the credibility question, it's very odd that all there of these blog posts make it to the Digg.com front page... several users consistently turn up as early diggers for all of the stories: olseneric, ebrage, MarkIsCranky and ZRock...

Silicon Valley Sleuth: Digg used for stock manipulation?