And I do check that--it's often a new account, but if they switch between name and user number that doesn't show and of course don't forget you can run with a fake user name. So there may only be 5 people but they can make it look like many more, especially if they start a new account, too. Blah.
So really it is pretty much learning to recognize the writing style and grammar, as you say. So many of the new 'posters' sound like maybe one of about 5 or 6 people.