This filter seems to only work on standalone words, not letter groups within other words. So, for example, it won't filter "motherfucker" if your filter is for the word "fuck".

Does Not work on FaceBook

i was hopping this would work on Facebook but it doesn't for me
it was either this or unfriend people who use profanity
guess im gonna unfriend a few people

blocks words matching an easily modifiable list. what more can you want?

I installed this script. It's pretty rudimentary and not very accurate. I wouldn't use this on a heavily visited site. You also have to maintain your own list. I had much better luck with http://www.webpurify.com

effective in bad language protection, for children for example.
but activating this script continuously will cause slow-down. since the database of Profanity words is not handled very efficiently (text-base compares, instead of binary compares).

So far so good. Thanks for helping me keep the filth out of my home! You never know what someone might say on Facebook!