If you want to put a link to your email address on your blog or web page so people can contact you by email, but you’re too afraid of spam, then Google’s free reCAPTCHA Mailhide is for you! :)
Predictions are derived from a number of factors including how often users search for a particular term. So if Google suggests something offensive, it’s a strong indicator that an awful lot of people are typing that particular phrase into the search box. :(
PS: It should be noted that Google no longer suggests the predictions mentioned in the article and it is now possible to report offensive predictions. I guess someone tipped them off!