If someone comes up on me while fishing I'll just stop fishing-start changing baits, looking through gear, or get on my phone. Once they leave I'll start up again. I've let a fish swim around for a while while someone stopped and talked to me, open bail and line going out when it ran, just so they don't know I'm catching. Also if I walk up to a spot I want to fish and people are already there I'll just not fish. It sucks but I don't want to start fishing and catching, and give up information to them that I've worked hard to figure out, and have them start catching and possibly keeping fish. Many times I've just walked around talking to people and chatted about fishing, making new friends, and never cast a line in the whole time. You need to be careful with the info-especially around strangers. You don't know if they are the ONE person who'll ruin your favorite honey hole. Pretty cynical I know but I've been burned too many times.