Beyond the release, Digg faced problems due to so-called "power users" who would manipulate the article recommendation features to only support one another's postings, flooding the site with articles only from these users and making it impossible to have genuine content from non-power users appear on the front page.[20]
A little piece of online history I didn't know: one reason Digg users migrated to Reddit was to escape power users manipulating content.
Ouch.