1. Choose a topic guaranteed to mobilise a sizable portion of forum-readers. Houseprices, for example, is always a fave. Or incomers. Or children. Or, let's say, breastfeeding. 2. Retire to a safe distance and play no part in the ensuing debate, chuckling as a load of people who essentially agree become more and more polarised as the ante is upped with each posting. 3. Put the kettle on. Job done!