It depends. On forums like this it would basically take a machine that would pass the Turing test in order not to be seen as an AI in any "meaningful" conversat

It depends. On forums like this it would basically take a machine that would pass the Turing test in order not to be seen as an AI in any "meaningful" conversation that it might join (so, not just a comment posted as a reply here and there). And even if the powers that be manage to get those future AI bots to post stuff that will very much resemble what we now post in here, it is my belief that the uncanny valley will be, in the end, impossible to pass (in fact that's one of the main motifs of many of Asimov's books when it comes to robots).