> pick said topic, something you never cared about before, talk about it but don't write any messages containing it; This does not work. How did you come about

> pick said topic, something you never cared about before, talk about it but don't write any messages containing it; This does not work. How did you come about the topic? Answer: it was in your brain, because advertising, trends among your peers and social connections, online trends real or astroturfed, etc. That's why you end up with people thinking their phone is "listening" to them.