Stocks fell sharply on Thursday as investors started to fear the U.S.-China trade war is slowing the economy.Marketsread more
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Oracle co-founder Larry Ellison disclosed a $1 billion stake in Tesla in late December. It's now worth about $580 million.Technologyread more
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Oil prices tumble as the market braces for a prolonged U.S.-China trade war and on signs the U.S. is willing to negotiate with Iran.Energy Commoditiesread more
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Stocks are plummeting on Thursday as trade fears wash over Wall Street again. Five experts reveal what they're watching.Trading Nationread more
"There's a few disturbing trends you cannot ignore. First one, you saw a recent study by SimilarWeb that discussed the actual use of social media is declining," Left said Wednesday.
He added, "Snapchat is getting good mind share [in the millennials age group]."
The short seller also expressed skepticism that Facebook, with a market cap of more than $320 billion, will be able to come up with new growth initiatives that will "move the needle."
"As a stock this a great time to sell," he said.
Left in October correctly called the decline in Valeant Pharmaceuticals. Citron Research, the firm he leads, is one of the few short selling research shops that consistently moves markets on newly released reports.
Shares of Facebook were down 1.5 percent for the week as of midday Wednesday.