Twitter replaces board member who left for Microsoft with ex-Google CFO

Crossing the social media divides isn't common in Silicon Valley, so it's notable that Twitter and Microsoft have played a spot of musical chairs with their boards.

Twitter board member Hugh Johnston -- day job: Pepsi vice chairman and CFO -- has left Twitter's board to join Microsoft's board as of today. Johnston's replacement at the microblogging company is Patrick Pichette, a former CFO of Google.

No sooner was Johnston's new role announced by Microsoft, so Twitter was trumpeting its own new addition, Canada-born Pichette, who served as Google CFO between 2008 and 2015.

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Twitter already has another former Googler on its board in the form of Omid Kordestani, its executive chairman, who joined in 2015.

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The trigger of these changes appears to be the decision of Microsoft board member G. Mason Morfit, president and chief investment officer of ValueAct Capital, to not seek re-election.

Microsoft's board includes company founder Bill Gates, Greylock's Reid Hoffman, Teri L. List-Stoll from Gap, and Bank Of America's Charles H. Nosk among others. The Twitter board, meanwhile, includes Peter Chernin, Martha Lane Fox, CEO Jack Dorsey and others.