I don't really agree with the moderator at FS2004.
If you've got an imposter, you've got to be aggressive and firm with him. In my opinion, if you're lassaiz-faire about it, you do nothing but attract more posers.
If you're not firm and aggressive with posers, then ANYONE claiming to fly a cool jet or have a great job is heavily scrutinized and constantly pressed to 'prove' it because the users are spring-loaded to be suspicious. And I'd say less than 0% of real professional pilots will tolerate it and will probably migrate to friendlier forums.
On another website, I answered a couple 727 questions and a moderator and several users wanted my real name in order to look me up in the FAA pilot database to confirm that I had a flight engineer certificate and my employee number to confirm my employment.
Screw that, yo! Needless to say, it's became a site heavy on wanna-be's and very light on anyone with real world experience. Besides, I'm not even in the public FAA database because of privacy concerns.
And the imposters aren't normally the users that say "Oh, I fly an F-15, but don't ask me any questions about it." They're way more flamboyant about their 'experiences' want to tell everyone and his uncle about flying the 'eagle' . That creates a scenario where a poser F-15 pilot is going to run nose to nose with a real F-15 driver and it'll get real ugly.
So I guess the short story is, at least around jetcareers, if anyone is a poser and we find out, it's going to really suck for you!