If you find a good spot it's up to you if you tell anyone or not isn't it? If you want it to yourself then don't tell anyone, simple. Remember though when you find a spot it's highly unlikely that your the only guy who's ever found it so don't get too upset if some one else is fishing it next time you visit.
Can you tell me one thing though, I understand some one may like to keep a spot they found to themselves, fair enough, but why if you work out a new technique would you want to keep that a secret? I don't get it. One of the things I like most about fishing is putting some one on to something new and hearing back how well it worked for them.
Cheers