Based on my experience, Wikipedia should be monitored:

• frequently, since entries can be created and changed at any time
  
• thoroughly, because damaging information can not only be found on the pages about an organization and its products, but on other pages as well
  
• multilingually, since there are Wikipedia versions in many languages and content varies greatly between the various Wikipedia sites
  
• topically, prioritized by known issues. If there are complaints about certain problems in other online communities, then there’s a great chance that something similar will be posted on Wikipedia.

This monitoring should be done by experienced media analysts, whose skills allow them to identify the most relevant information - better than any software package could do. They should also be able to recommend a strategy to their clients to counter inaccurate information about them found on Wikipedia or in other online communities.