advertising seems more stable than subscription based. At least according to the Economist, advertising spend changes little during recessionary periods.
What sort of advertising? I can see "brand awareness" advertising being reduced, but why reduce any 'results based' advertising? There's not real reason to reduce advertising that yields a positive ROI - which is easily measurable these days usually.
I'm not sure if advertising is stable or not, but there's been a lot of talk about how it's going to collapse (and how Google is going to be worth $2/share, doom-and-gloom). I think that's the reason for this guy's question.
Fair enough to only consider one though :)