Should I?

I have been having some arguments with myself recently. Even though this is an English blog and I am an Englishman most of my visitors seem to be from Canada and USA.

So here is my predicament. How should I spell things. Should I write organising or organizing?

Is it more correct to use North American spelling or should I stay stubborn. Will Google and Co. be unhappy at me or what they may see as misspelling, and let my search engine ranks slip?

I am still confused and will have to let you know when I make my decision. Until then expect mixed spelling.