Anarchist dating service
The continuum of unlinkability can also be seen, in part, on Wikipedia.
Additionally, Wikipedia's public record of a user's interest areas, writing style, and argumentative positions may still establish an identifiable pattern.
System operators (sysops) at sites offering pseudonymity, such as Wikipedia, are not likely to build unlinkability into their systems, as this would render them unable to obtain information about abusive users quickly enough to stop vandalism and other undesirable behaviors.
Law enforcement personnel, fearing an avalanche of illegal behavior are equally unenthusiastic.
In a study of a Web dating service and a pseudonymous remailer, University of Cambridge researchers discovered that the systems used by these Web sites to protect user data could be easily compromised, even if the pseudonymous channel is protected by strong encryption.
Typically, the protected pseudonymous channel exists within a broader framework in which multiple vulnerabilities exist.