Activision revealed two days ago that Call of Duty: Ghosts generated $1 billion in worldwide revenue on launch day. Activision made clear in its announcement that it “sold more than $1 billion of Call of Duty: Ghosts into retail stores worldwide as of day one,” which technically means that this figure is based on the units sold to retailers and not on the number of units that ended up going to a consumer. In comparison to previous installments of the game, Call of Duty: Black Ops II took 15 days to reach $1 billion in sales, however this figure included units sold to consumers and not only to retailers. After referring to data from Microsoft, Activision also revealed that Call of Duty: Ghosts has moved to the top spot on Xbox Live as the most-played game this week. Activisio...