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Major U.S. tech companies have yet to provide to the public all the details of Russian troll activity on their platforms despite their pledge to tackle the problem and pressure from some lawmakers, The Wall Street Journal has found.  Six months after social-media firms agreed in congressional hearings to work with lawmakers investigating Russian efforts to interfere in U.S. politics, many specifics about the foreign interference operation remain undisclosed.  , a former FBI counterterrorism agent who now tracks Russian propaganda.

Major U.S. tech companies have yet to provide to the public all the details of Russian troll activity on their platforms despite their pledge to tackle the problem and pressure from some lawmakers, The Wall Street Journal has found.  Six months after social-media firms agreed in congressional hearings to work with lawmakers investigating Russian efforts to interfere in U.S. politics, many specifics about the foreign interference operation remain undisclosed.  , a former FBI counterterrorism agent who now tracks Russian propaganda.

[$$] Much Remains Unknown About Russian-Troll Accounts on Social-Media Giants

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Stocks ( ^DJI ,  ^GSPC ,  ^IXIC ) push higher despite opening in the red. The technology ( XLK ) sector is most in the green, and the energy ( XLE ) sector is most in the red.  Alan Valdes of Silverbear Capital  joins us live from the floor of the New York Stock Exchange to talk markets. To discuss the other big stories of the day, Yahoo Finance’s Seana Smith is joined by  Pras Subramanian,  Melody Hahm and Nisha Dua of BBG Ventures .

Yahoo Finance&apos;s LIVE market coverage and analysis of stocks and bonds begins each day at 11:45 a.m. ET.

Stocks strengthen, April jobs report, Bank of America warns unemployment fell for &apos;bad reasons&apos;

Childish Gambino's New Track "This Is America" Has People on Twitter Stunned
Complex

CNBC&#39;s Julia Boorstin reports on the Twitter bug involving passwords.

May 4, 2018
Let’s check out the Yahoo Finance charts of the day.
Apple ( AAPL ): Shares are up in early trade,  around 2.1%.  Billionaire investor Warren Buffett tells CNBC that he added 75 million shares of the tech giant’s stock to his portfolio.
Twitter ( TWTR ): Shares down here, around 2.0%.  The social networking service urged its users to change their passwords after a glitch in its internal computer caused some passwords to be readable.
Nike ( NKE ): Shares up, around 0.52%.  Last month Nike’s toxic workplace culture was revealed and Wall Street Journal reports that CEO Mark Parker apologized to his employees at an all-staff meeting this week.
For more on today’s big stock movers check out the Final Round, live at 3:55 p.m. ET, right here on Yahoo Finance. 