Just to be clear, I'm not advocating troll hunting but what makes you suspect a thread is the work of a bridge dweller and makes you give it a wide berth and/or report to MNHQ? I was thinking quite often the post just seems a little off or implausible and I've tried to think what often arouses my suspicions.
A few things that set my spidey senses tingling are:
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The tone is at odds with the material/dilemma or shifts dramatically across the thread.
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Events move too quickly and the revelations come thick and fast.
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A 'twist' in the last few lines of the post (to make up an example a long post asking for advice on 5* hotels in the Maldives and in the last line saying something along the lines of 'I can only go the last week of August as I 3rd September is my signing on day at the dole.')
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Anything to do with a well known sexual fetish (pissing/shitting/bukkake) I'm a bit suspicious about.
This isn't about any particular thread or poster and one of those things on its own isn't enough to set alarms ringing in my head, but what makes other posters start scratching their chin and think 'hmmmm chinny reckon'?