(The Signpost 9 October 2013) An investigation by the English Wikipedia community into suspicious edits and sockpuppet activity has led to astonishing revelations that Wiki-PR, a multi-million-dollar US-based company, has created, edited, or maintained several thousand Wikipedia articles for paying clients using a sophisticated array of concealed user accounts. They have managed to do so by violating several Wikipedia policies and guidelines, including those concerning conflict of interest in paid advocacy—when an individual accepts money to promote a person, organization, or product on Wikipedia—and sockpuppetry.
The Signpost has the story here.