Updated from 7:09 a.m.

NEW YORK (TheStreet) -- Here are 10 things you should know for Friday, June 12:

1. -- U.S. stock futures were heading down on news that Greece's debt negotiations are faltering.

European stocks were sinking on fears that Greece's debt talks have collapsed. Bwin.party Digital Entertainment (PYGMF) fell 10.5%.

Asian stocks rose across the board, with Japan's Nikkei, Hong Kong's Hang Seng and the Shanghai Composite all up.

2. -- The economic calendar in the U.S. on Friday includes producer price index -- final demand at 8:30 a.m. and consumer sentiment numbers at 10 a.m.

3. -- U.S. stocks on Thursday rose modestly, extending Wednesday's rally.

The Dow Jones Industrial Average (DIA) rose 0.22% to 18,039.37. The S&P 500 (SPY) increased 0.17% to 2,108.86. The Nasdaq (QQQ) went up 0.11% to 5,082.51.

4. -- Dick Costolo, the CEO of short-form social network Twitter (TWTR), said he would step down. Twitter's co-founder and chairman Jack Dorsey will become interim CEO on July 1 while remaining CEO of Square, a payments company.

Investors, including early Twitter investor Chris Sacca, have criticized the company's strategy and its communication with investors. Sacca recently explained how he thinks Twitter should revamp itself.

In premarket trading, Twitter stock was rising by 3.8%.

5. -- Greece seems closer than ever to a debt default. The nation owes the International Monetary Fund €1.6 billion ($1.8 billion) by the end of the month, but Greece needs continued lending from Europe to stay afloat. Other European nations, especially Germany, seem reluctant to extend more loans without bigger concessions and more austerity from Greece.

6. -- Americans' net worth hit a new high in aggregate -- $85 trillion. The first-quarter numbers show the impact of a rising stock market and a return of higher real estate values. The total net worth figure went up about $1.6 billion in the first three months of the year.

Greater household wealth and an improved job market are signs of a larger economic recovery.

7. -- Organic-focused grocer Whole Foods Market (WFMannounced more details about its coming subchain of stores, to be called 365 by Whole Foods Market. The stores will begin opening in 2016. The new stores will be cheaper than the famously expensive Whole Foods stores, and will have a smaller footprint.

In premarket trading, Whole Foods stock was dropping by 0.41%.

8. -- Facebook (FBshareholders shot down a plan that would have reduced CEO and founder Mark Zuckerberg's voting clout. Activist investor Northstar Asset Management was campaigning to change the shares' voting structure. Currently, pre-IPO shares in the social network get 10 votes on shareholder matters, while post-IPO shares get one vote. Zuckerberg owns about 54% of the voting power in the company, allowing him to maintain control.

In premarket trading, Facebook stock was sinking by 0.61%.

9. -- Rupert Murdoch, the head of a variety of media businesses from movies to newspapers, will step down at the head of 21st Century Fox (FOXA); his son James Murdoch will take the reins. Rupert Murdoch, meanwhile, will become executive chairman of the company, along with his other son Lachlan Murdoch.

The succession plan moved Fox's stock down 0.46% in premarket trading.

10. -- The Internal Revenue Service is adding anti-fraud measures to prevent identity theft. In a spate of recently discovered cases, criminals used already-obtained identity information to crack into old tax returns and then file new fake returns for big refunds -- at least $39 million in total. 

The new system will allow cross-checking between different tax software companies and the IRS. The hope is that the new checks will allow the IRS to catch fraud early or before it can pay off.

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