Reverse tactics
Shirley it wouldn't be too hard to compile a list of "contributors" to the page? not necessarily to track them down, but if their name comes during an RBT check I'm sure it wouldn't be too hard to throw the book at them.
Not all criminals are morons, but many contributors to these pages are - I've looked at a couple of the NSW equivalents, and the number of people who slag off cops whilst leaving their personal accounts on "public" is alarming - particuarly when their profiles show pictures of burnouts, boasts of what top speed they've hit, etc.
The page itself I don't have an issue with (despite being kind of useless - unless you memorise every plate on the site, you're still not going to know every undercover car on the roads) but the people using it don't seem to be the most clued-in types.