It looks like Google Trends ranks overrepresentation of cities, regions, and languages for specific queries. Arabic browsers are most likely to search for sex, Chinese most likely to search for Tiananmen. Past posts on Islamic sex and Tiananmen.
A term needs pretty heavy search volume to be trended, which is probably good — massive ego searchers will not be revealed, much to their disappointment.
Prediction market doesn’t make the cut, though I predict it will soon.
Creative Commons confirms the success of CC-Spain (of which I’ve seen other indicators), particularly in the Catalan-speaking region.
Google Trends doesn’t seem to do stemming nor does it suggest spelling alternatives.