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.

The U.S. dollar index edges lower against most major currencies, pulling back a bit after its longest rally since at least 1985, as traders anticipate news from this weekend’s Group of Eight meeting.

European stocks end lower, dragged down by continuing worries over debt problems in the euro zone.

Social network’s shares see mixed trades in debut as a public company. Facebook priced its $16 billion IPO at the high end of its expected range.