G is for Alphabet
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The "core businesses" seem (from the press reports I can find) to include search, YouTube, Android and Chrome. Apparently Google+ is one of those non-core businesses. Rumors of its imminent demise may be about to come true.
BTW: Google also hasn't quite buttoned this up from a social media point of view. Did it never occur to anyone to secure the @alphabet Twitter name before the announcement? Read.