Goldman Sachs CEO joined Twitter after reading a book by this billion dollar tech chief executive

But now Hootsuite Chief Executive, Ryan Holmes says he is responsible for Blankfein’s renewed social media presence. Talking to CNBC in an episode of Life Hacks Live, Holmes claims his book, The Four Billion Dollar Tweet, inspired Blankfein to get online....

Wal-Mart drops 6%, Kroger dives 11% in premarket on Amazon-Whole Foods deal

News that e-commerce giant Amazon.com is buying grocery store Whole Foods Market sent grocery stocks reeling on Friday. Shares of large grocery chains dropped pre-market following the news. Kroger sank nearly 11 percent before the bell. Supervalu dropped 4.3 percent...