I've set strict guidelines and their computer is in the kitchen in plain view at all times. I am still working on a relationship based on the "trust, but verify" principal at this time. We have had honest and frank discussions in the past about things I would rather approach and clarify before anyone else gets the chance to, but I know where curiosity can lead.. I was just hoping to stay a step ahead.
I'm still wrestling with the idea of shielding them from something that I know they're gonna be exposed to anyway. I might just be naive, but I feel that I can address any issue better than friends at school or whoever else gets the chance and with proper discussion, it won't be such a "rush" to explore it on the internet.