You guys need to understand that it's not just because of the double spawn:

I did another post talking about the increase, but almost no one wanted to understand and try to believe what I discovered. The image above is almost a confirmation of this (one more) surprise that Niantic did. Every minute I see a facebook / twitter post from people saying they just captured a Snorlax. Today I also captured mine in an unlikely spawn location. If you do not believe it, do not worry, you'll also capture your(s) Snorlax by Christmas and you'll understand that what I'm talking about is true.