How will windows 8 help SEO and SEM as well?

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It can only help by making work done faster i;e Social Presence via windows apps.

"Windows 8 lets you automatically connect to Facebook, Twitter, LinkedIn, Google, and other social services. If you link these accounts to your Windows 8 PC, Windows 8 will sync your mail, appointments, contacts, and more from your social media accounts to your PC"

So if you can encapsulate all your social media in to one platform, you will be able to share more information as possible. That mean more real time data to search engines. Hence more data for SEO SEM spay to analyze, which in turn more revenue for online business.

But, believe me this is a pain in a**


Good Luck