Analysis of information sources in references of the Wikipedia article "Reference.com" in Simple English language version.
The one site that installed the most was Dictionary.com. A visit to Dictionary.com resulted in 234 trackers being installed on our test computer, and only 11 of those were installed by Dictionary.com. ... So on Dictionary.com, the vast majority of the trackers (200 out of 234) were installed by companies that the person visiting the site probably had never heard of."