Hangouts can also integrate with Google's YouTube.

CNN: How Google+ compares to Facebook

Mr. Pichai is likely to be more accommodating and willing to integrate Android with more Google services, these people said.

WSJ: Google Android Chief Andy Rubin Steps Aside

Google can integrate mobile versions of Google Apps with the Nexus One and potentially provide bundled pricing of Nexus One phones along with apps.

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Google might also seek to integrate Sun software with its Gmail offering, with a view to challenging Microsoft's Outlook.

BBC: Analysis