Bluffing is great if done correctly. I would argue that you need to bluff in at least one of every twelve full rounds, if not you will become too predictable and will deter others to bet when you do so.
Bluffing is of course core when it comes to poker in person or online but what's strange to me that I did not hear of this twelve round business. Though, i admit it does seem to be effective and sure enough there's no point in bluffing if the hand you get is the worst you could have.
It would be interesting to see if people already devised their bluffing rounds or if they just do it when they feel confident as and when they get a relatively good hand. Trickery is important but I'm of the opinion that you must have a basis also.