Over the weekend the Democratic Alliance (DA) announced that it had demoted its shadow police minister, Dianne Kohler Barnard, after she re-posted a comment on Facebook suggesting that some aspects of South Africa were better under PW Botha. The African National Congress celebrated the DA's discomfit, while DA leaders muttered earnestly about how they would use their structures to deal with this. Kohler Barnard herself had already apologised, but it is a story that will stick around for some time. As a political incident, it is rather revealing about where our politics is, and about the strengths and dangers of us, as South Africans, discussing our lives on Twitter and Facebook. By STEPHEN GROOTES.