You probably need to check out the names of all posters tonight - numbers after their names tend to indicate (im)posters - especially if they have jellymen avatars. Typical weekend posting.
generally though the name wont be an exact copy and the imitaters will say something out of character which will raise suspicions, so it wont be flawless by any means.
Well, if this worked there should be an avatar - showing not one, but two 4legs, for those who are interested. If it didn't work, it's late and I'll have to try again another time (I'm an hour ahead of UK time here).