Here those is URL as board left (functions with each board often commodity):
WHAT IS A hidereff?
A hidereff is a website that is used to redirect users to different websites. Usually, web browsers send small pieces of information when following a link, including a so-called "referer". The referer is the URL of the page the user came from, giving webmasters the option to track back the origin of users visiting their sites. The dereferer's part is to suppress this information; when analysing their transfer logs, webmasters will track back to the dereferer's URL instead of the original URL.