Halloween at MSN, Yahoo and YouTube

I guess you understand that Halloween is a big thing when huge companies edit their logos in order to celebrate it.

I discovered earlier today that MSN, Yahoo and YouTube have made the proper changes. I am just wondering, why are they doing it?

Is it just in order to celebrate? Because Halloween is a big thing in the US, and many other countries as well, even in Norway (among the kids).

Is it marketing? Because people notice, and people like it, and many think it’s funny.

Finally, where is the Halloween logo from Google? They did it at Christmas, why not for Halloween?

Guess what, I discovered just as I published that Google Norway has changed their logo, but not Google.com, interesting.