"Trading" is discussed on Hacker News at about a 1.5-to-1 ratio with "trolling". FYI, Google Fight accepts the same "site:" specifier that Google Search does. For example:

http://www.googlefight.com/index.php?lang=en_GB&word1=si...

If you have reading problems, you could use that technique to determine which of 2 words you're more likely to be reading here.