Ditto what most everyone said. Theoretically, it is possible for Rollitup to give your info to law enforcement. Realistically, it would never happen. Cops have neither the inclination nor the manpower to spend countless hours online trying to bust some guy growing a few plants. I've never heard of a single case of a large grower/dealer that got busted solely because of what he/she posted on some random blog. Cops usually get the internet evidence after they have made the arrest, and they have enough evidence to convince a Judge to give them a court order compelling Rollitup to cough up the info.

Then again, they could be out to get you