Eurogamers 2011 Expo in London.
This kind of technology allows people to not only count attendence of twitter users at certain events, but also to guage in real time what people at specific places or events think the activity. It opens up new ways of doing rapid, agile research that is ground in place and time without having to send field workers to the site.
By the way we could not see any games really going viral among twitter users at the expo. So we might assume that we will be entering a Christmas season without the presence of a much have game. Lets see how it goes.