As originally described, this hack adds an "Ignore Thread" option to the thread tools menu and generates a list of threads you have ignored in your UserCP.
Basically it allows your users to ignore threads of their choosing, preventing said threads from showing up in forumbit, forumdisplay, and search results.
Ignore Thread - vBulletin.org Forum
May we please have this .
Then members may ignore the puerile crap some of our immature members delight in .