Here are 10 things you should know for Thursday, April 28:

1. -- U.S. stock futures were tumbling Thursday and European shares fell sharply after Japan's central bank disappointed investors by standing firm on rates, dashing hopes for further stimulus.

Asian stocks ended Thursday's session mixed but the Nikkei 225 in Tokyo declined 3.6%.

2. -- The economic calendar in the U.S. Thursday includes the advance first-quarter reading on U.S. Gross Domestic Product at 8:30 a.m. EDT, and weekly Initial Jobless Claims at 8:30 a.m.

3. -- U.S. stocks on Wednesday ended mixed as tech earnings disappointed while crude oil spiked and the Federal Reserve demonstrated its dovishness yet again. 

The S&P 500 rose 0.17%, the Dow Jones Industrial Average rose 0.28%, and the tech-heavy Nasdaq traded lower by 0.51%.

4. -- Facebook (FB - Get Report) shares surged 8.3% in premarket trading on Thursday following the release of better-than-expected first-quarter earnings and revenue. 

The social network reported adjusted earnings of 77 cents a share vs. 42 cents in the year-earlier period. The figure topped analysts' estimates of of 62 cents a share.

Revenue increased by 52% in the quarter to $5.38 billion, beating analysts' expectations of $5.25 billion. 

Facebook's advertising revenue rose 57% year over year to $5.2 billion, with mobile advertising revenue representing roughly 82% of all advertising revenue for the quarter. 

Monthly active users grew by 15% in the quarter to 1.65 billion, while daily active users increased by 16% from a year earlier to 1.09 billion.

"The results, simply, speak for themselves," wrote Jim Cramer and Jack Mohr of Action Alerts PLUS, which owns Facebook. "We fully embrace Facebook's continued outperformance. The ability of this management team to execute on its lofty goals is unmatched and its investments are clearly paying off.

"The best part? Even though some may be wary of what may seem, at face value, as a hefty valuation, we see many more growth opportunities ahead (e.g., Live Video, Messenger, WhatsApp, Instagram, Oculus, etc.), Cramer and Mohr wrote.

Separately, Facebook announced it will create a new class of non-voting stock, known as "Class C capital stock," designated to let CEO Mark Zuckerberg keep tight reins on the company even as it issues more shares to compensate employees and investors.

5. -- France's Sanofi  (SNY - Get Report) on Thursday went public with a campaign to buy Medivation  (MDVN) , disclosing that a $9.3 billion cash offer for the San Francisco developer of cancer medicines had fallen on deaf ears.

Sanofi described its proposal, pitched at $52.50 a share, as nonbinding, and published a letter from CEO Olivier Brandicourt to Medivation President and CEO David T. Hung urging a meeting. In the letter on Thursday, Brandicourt complained that the target had ignored an April 15 letter outlining the proposed terms of the Sanofi offer, having rebuffed the suitor in a phone call on April 3. The two sides held their first phone conversation on March 25, Sanofi's letter stated.

Medivation closed on Thursday at $52.05, making the Sanofi proposal less than a 1% premium to that price. However, Medivation shares were trading at $41.25 a month ago, and Sanofi said its proposal was 50% more than the two-month average share price before takeover rumors emerged.

6. -- Deutsche Bank  (DB - Get Report) posted first-quarter profit that beat analysts' expectations. The stock was rising 3.5% in morning trading in Frankfurt. That's a welcome change as shares have dropped 26% in the last year.

The bank's profit of €236 million ($268 million) surprised analysts, who had expected a loss of €249 million. This was down, however, from the first quarter of 2015, which saw profit of €559 million. Non-interest expenses declined 17% due to a drop in litigation charges. 

However, revenue at Germany's largest bank was down 22% year on year, reflecting a challenging environment during the first quarter and a weak outlook for the global economy.

7. -- Sony (SNE - Get Report)  reported a loss of 88.4 billion yen ($818 million) in the January-March quarter, a narrower loss than a year earlier. But the electronics giant postponed Thursday giving its annual outlook until May, citing damage from major earthquakes in southwestern Japan earlier this month.

The quakes shut down Sony Semiconductor Manufacturing's Kumamoto Technology Center, which makes image sensors and other devices.

Quarterly sales for Sony slipped nearly 6% from a year earlier to 1.8 trillion yen ($16.9 billion). 

For the fiscal year ended March 31, Sony posted a 147.8 billion yen ($1.4 billion) profit, a reversal from a 126 billion yen loss a year earlier. It was the first time in three years that Sony was able to post a profit.

Revenue grew 19% to $2.54 billion, vs. a forecast of just more than $2.5 billion. Earnings per share increased 28% to 37 cents, 2 cents above the consensus.

"In many ways this was our best quarter since I joined PayPal," CEO Dan Schulman told investors during a Wednesday conference call. Schulman joined the company in 2014 and led it through the July 2015 spinoff from eBay.

"The results were broad-based, thorough and convincing, effectively derailing bearish concerns around competition," said Jim Cramer, TheStreet's founder and manager of the Action Alerts PLUS portfolio, which owns PayPal.

9. -- Standard & Poor's analysts cut their outlook on IBM (IBM - Get Report) to negative, following the tech giant's 16th consecutive quarter of declining sales and a reduced forecast for second-quarter earnings.

10. -- Earnings are expected Thursday from Amazon  (AMZN - Get Report) , Expedia  (EXPE - Get Report) , Groupon  (GRPN - Get Report) , LinkedIn  (LNKD) , Ford (F - Get Report) , ConocoPhillips (COP - Get Report) , MasterCard (MA - Get Report) , Dow Chemical (DOW) , AbbVie (ABBV - Get Report) , Colgate-Palmolive  (CL - Get Report) and Dunkin' Brands (DNKN - Get Report) .

Dow Chemical is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells DOW? Learn more now.