Derivatives regulation being drafted by regulators and a tougher Volcker rule will be enough to prevent other banks from suffering losses similar to J.P. Morgan Chase’s surprise $2 billion-plus trading loss, Rep. Barney Frank says.

A MarketWatch column on May 18 about social-media site Twitter’s adoption of a “Do Not Track” feature gave incorrect information about which Internet browsers support the new feature, and incorrectly described Twitter’s use of computer cookies.

Twitter is adopting a “Do Not Track” feature that the social-media site’s users can tap to help guard their privacy. But it’s not a cure-all, writes Jennifer Waters.

Sometimes, a landlord either can’t or won’t help tenants deal with noisy neighbors, Lew Sichelman writes in the Realty Q&A column today. What’s the solution? It’s a tough one—sometimes you just have to call the cops.

Shares of NASDAQ OMX Group Inc. drop on Friday, weighing on the financial sector, as the exchange operator is hit by problems with the trading of shares of social networker Facebook Inc., which makes its eagerly awaited public debut.

Oil futures extend losses Friday, looking at a sixth consecutive day of declines as investors remain concerned about global growth and demand for oil as the euro zone’s debt problems rage on.

U.S. stocks nearly unchanged after Facebook Inc.’s trading debut and ongoing uncertainty about how Europe’s debt troubles will play out.

Facebook’s much-anticipated trading debut had a rocky start Friday morning, with the expected opening of the $16 billion initial public offering pushed back by about 30 minutes.

Other companies in the social media galaxy also saw their shares roiled during the Facebook stock kickoff, the biggest initial public offering of an Internet company to date.

London stocks drop on Friday, with banks and energy majors bearing the brunt of losses.