If you've read wikisposure you've noticed that they like to quote extensively. All it takes is to use the computer's save, copy and printscreen functions. Others may also take an interest in something you've said.

Stuff that you think you've posted in a non-googlable environment may turn up in the googlosphere anyways. It's safest to consider anything posted on semi-public (registration-required) web forums as being "out there."