I have seen many people going out of the track during the discussion. Then the argument will become heated and go other ways. We have to struggle a lot to bring back the discussion on track. But many times the unknown persons' opinions may match with our opinions. In such conditions, the argument will not go as an argument but will go as opinion sharing.
There are many discussion forums where we debate with unknown people, and even their real names are not known to us.
K Mohan @ Moga
'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease