As long as you keep safe out on the streets and don't get caught you're fine. Even then there is a small chance of them actually finding you on the Internet, they would have to guess your screen name etc. If the police really wanna' find you they will, they don't have to look at your "myspace" or check your threads about your "neighbourhood" they will just trace your IP from the forum. Even proxies aren't safe when it comes to the police.

If it's more of a case of you coming on here and talking about using weed then I don't think you have to worry much, police have far more important jobs to do than wasting time busting us smokers on an Internet forum. I have seen many cops be very lenient when it comes to finding a small amount of weed on a person, they will obviously confiscate it but that's about it. Maybe a different story if you talk about dealing...who knows? But what I will say is that without a shadow of a doubt the police visit and or watch here. This is a brilliant place to learn any new lingo or to understand a drug user. I just wouldn't worry too much.