if it bothers, you could choose search posts or title only most likely if you want to grab wikipedia as main search term, most people will have it in the title otherwise, it'll be merely be talks about wiki
"Wikipedia" is somewhere in those posts listed. It is usually just people mentioning the site during random chatter. Try searching only topic titles?
LOL! I'm not sure that's the case, but I've searched just the titles and I am still getting a pile of unrelated threads without the word "wikipedia" in the title. I guess it's time to reboot, or throw this windows system out the window. LOL!