Why are there non-related Hyperlinks created automatically in most threads?

 

Those are a result of being affiliated with Intellitxt. They can be turned off by dragging your mouse across the hyper link....and right clicking on the Intellitxt bar that comes up in the little popup window. A new window will open up and at the bottom of the page you can disable them. However, be warned.....they will re-enable if you delete the cookies in your IE Cache....