I don't (and for the same reason, pagesvoice, that you mentioned elsewhere here). Besides that, I always think of what my father used to say when any of us would be expressing disapproval of what some kid at school did (when it had nothing to do with us). More than once I've repeated his advice, "Don't you worry about what other kids are doing. That's for them and their parents and the teacher to worry about. You worry about what YOU do."
If all the people who feel the need to point out the errors of others would instead get to work cleaning up all their own errors (and anything else that makes their work on here less than perfect) those people would be good and busy, and using their time most constructively, for quite awhile. :)