Winnie “Elsewhere on these boards people have pretty much come to the conclusion that tochacha can only be given if the person knows that his words will be heard and not do more damage. On an anonymous fourm when one does not know the poster or how he will take tochacha, can one give tochacha? ”
The Halacha is the opposite. One must give tochacha unless he’s sure he’ll be ignored and the sinner will continue sinning. If he’s unsure how it’ll be taken, he must give tochacha.