There have been numerous complaints to OTRS about enwiki's bot generated spam reports[1] showing up high on search results, associating the site with spam, even though that isn't always the case, many things will result in a report being generated: account name is "similar" to a domain, IP "close" to the domain adds the link, and there's little differentiation between someone who adds one link and someone who adds 100.
Adding the following to robots.txt in the section to disallow all user-agents should fix this:
Disallow: /wiki/Wikipedia:WikiProject_Spam/LinkReports/
Disallow: /wiki/Wikipedia%3AWikiProject_Spam/LinkReports/
Version: unspecified
Severity: enhancement
URL: http://en.wikipedia.org/robots.txt