Don't be boastful about what you are doing and don't brag about your massive yields or large number of plants. Make yourself look like as small of a fish as you can. And don't feel bad about fibbing a bit now and then. For years I have numerous times mentioned a certain grow or a certain problem and solution that happened a couple years ago or last year or a few months back during the last grow I had going. In reality it had just happened or was at that time happening. I always make it sound like I am in between grows, and might not be starting another one for some time to come, for some logical sounding reason or another. Why let someone who might possibly be tracking you know that right now would be a good time to pay you a visit when instead you can make it sound like if they come they will find the cookie jar is empty?
If you have a current problem and have to post pictures to get advice you cannot of course do that, but if you do, do it smart. But other times ... why in the wide, wide world of sports would you ever want anyone to know that you presently have something under lights?
If you say it here, everyone here will know, including Mr. John Q. Law who might happen to read your message and who already might be sniffing out your trail or who has had you on his mind and with what you said then have enough reason to put his nose to the ground and begin to sniff out your trail.