The thing some people miss about word-of-mouth and word-of-mouse is that if you don’t buy any advertising or do any PR whatsoever i.e. if you rely wholly on word-of-mou(th)(se) - it makes every new customer/ reader/ fan think (s)he’s had an invite to join. cf. Popbitch - about the best e.g. of this I can think of, and Paddi Lund the Dentist - about the second best. Incidentally, this week’s thing that I believe is true, even though I cannot prove it: customers that join via these kinds of implicit invites are, on average, at least five times as profitable. Er, discuss.