NEVER lol....Bluffing online is hard and in my opinion rarley works. I have bluffed a few times and gotten away with it, other times I have tried to steal the pot and gotten ran over!
Yesterday for example (this is not a bluff on my part just a really good play on the other guys part). I had K 10, flop came A A 6, everybody checks, next card is a K, everybody checks to me, I bet, one guy calls, river card comes something like a 5, I figure he has two pair, maybe??? Maybe trying to hit something so I bet he waits and calls with Trip Aces.....He slow played the crap out of them, I have had others raise me with nothing or go all in with nothing....Online poker is strange and can be very dangerous I think.
I have started playing super tight, even when I know I have the goods just to be safe. Obviously if I know I have the highest flush, or think I have the best full house then I will be loose. However when I have a pair, or two pair, I play tight because it seems when I have two pair, somebody has two higher pair.