I'm just speculating here, but:
1. It's normally the first use IN COMMERCE. You would have to prove you are using the mark in some specific commercial use. I'm not sure a parked page would meet that definition or be specific enough of a product or service.
2. If parked, it wouldn't normally have the "TM" symbols to show you are claiming a Trademark, which may not be required, but would be a big plus.
3. I haven't heard of this being enough, and likely it would have to be decided by a judge or jury.