Figure 1.
Different ways of defining signs in simple triads. Agents’ opinions are depicted as symbols: (in support), 
(unsure), (against). Edge color and symbol next to it inform about the sign of the edge (blue and 
is for positive; red and 
for negative). The color of the filled triangle corresponds to the triad’s balance type – blue is for balanced and red for unbalanced. The left column corresponds to the rule that an edge is positive only when it connects endpoints with the same opinion. The right column corresponds to the rule that an edge is a negative only when it connects endpoints holding two different extremist opinions. Both these interpretations lead to the same type of triad’s balance. A triad is balanced when at least two of its nodes hold the same opinion (triads a and b, and c to h) . An unbalanced triad arises only when all its three agents hold different opinions (triads i and j).