How do you implement a good profanity filter?

Question

Many of us need to deal with user input, search queries, and situations where the input text can potentially contain profanity or undesirable language. Oftentimes this needs

Answer 1

Don't.

Because:

• Clbuttic
• Profanity is not OMG EVIL
• Profanity cannot be effectively defined
• Most people quite probably don't appreciate being "protected" from profanity

Edit: While I agree with the commenter who said "censorship is wrong", that is not the nature of this answer.