  In the Sznajd model of 2000, a pair of neighbouring agents on a square
lattice convinces its six neighbours of the pair opinion if and only if the two
agents of the pair share the same opinion. It differs from other consensus
models of sociophysics (Deffuant et al., Hegselmann and Krause) by having
integer opinions like $\pm 1$ instead of continuous opinions. The basic results
and the progress since the last review are summarized here.
