Find the line
$keywords .= $word . ", ";
ad this line just above the one you just found
$word = preg_replace("/[^A-Za-z0-9]/","",$word);
After that you will have no "special characters" in your keywords that would throw a SE off.
Thanks for a great plugin!
And...if you have special characters in your language?
My sites are in spanish and you code makes ñ,á,é,etc disapears. But I'm happy you've found the best way for you.
Thanks for your review.