In the words of the 733t, "WTF?"

Okay... does anybody who is in my class know how to get rid of the damn spammers on the comments section? I want to have a comments section, because I like having a place for people to leave feedback. What I don't like is writing about the news media and then being told how cool my blog is and how I should check out a blog for HUMMINGBIRD FEEDERS. I love the concept of a machine parsing my text and seeing that I compare McLuhan's writing style to a hummingbird, and then making the logical operation that I must be a bird enthusiast.

IF "Dieses ist mein Handel" prints "hummingbird"
THEN "Dieses ist mein Handel" = Audubon member
ELSE select another arbitrary buzzword
AND faith_in_humanity = faith_in_humanity - 1

Can anyone help?