Call of Duty 4 Best Selling Game of 07??

For some reason, I really think this story is BS. I think its probably because Activision is saying it. I mean sure it deserves it, it was definitely one of the best games of last year and apparently beating Halo on Live but can it really beat Halo in sales? Last I heard, Call of Duty had sold about 3 or 4 million copies and suddenly the numbers skyrocketed to over 7 million... Thats a little strange to me. Well, whatever the number is one thing is for sure: Activision had one hell of a year in 2007. Oh yeah, and for the record, I think Call of Duty 5 will be a bust (like Call of Duty 3).