It's going to take more than Facebook's initial public offering to push the stock market higher.

Facebook shares rose 23 cents above their $38 offering price. It seemed like everything else fell.

The Dow Jones industrial average has been in a slump over the past two weeks as traders saw an escalating risk that Greece could leave the euro, causing more disruptions in markets. Remember the go-go days of May 1, 2012? The Dow was up 8.7 percent for the year. After Friday, it's up just 1.2 percent.

On Friday the Dow Jones industrial average dropped 73.11 points, to close at 12,369.38. It fell 3.5 percent for the week. The Dow has now declined on 12 of the last 13 trading days.

Nine of the 10 industry groups in the Standard & Poor's 500 index fell. Financials dropped the most, 1.1 percent.

First, Facebook.

Trading for the year's most eagerly awaited initial public offering was delayed about 30 minutes because of a glitch at Nasdaq. Nasdaq said the problem was with sending messages about whether trades had been executed. It was almost two-and-a-half hours before it said its trade messages were working normally.

The glitch sent shares of Nasdaq OMX Group Inc., parent company of the Nasdaq market, down 4.4 percent.

Facebook shares were priced at $38 and initially traded as high as $45. They closed at $38.23.

Europe was the bigger worry for investors. The Fitch ratings agency dropped Greece to the lowest possible grade for a country not in default Thursday. Fitch said Greece's departure from the euro "would be probable" if elections next month do not reverse political trends in Greece, which have brought in politicians opposed to the terms of Europe's bailout.

Also, ratings agency Moody's downgraded 16 Spanish banks late Thursday, three days after downgrading Italy's, noting they are vulnerable to huge losses on government debt.

Representatives of the G-8 are meeting this weekend at Camp David, looking for assurances that leaders in Europe can contain damage if Greece leaves the euro.

"Despite all the attention on the Facebook IPO, I think there's still lots of underlying uncertainty surrounding this European debt situation," said Scott Wren, senior equity strategist for Wells Fargo Advisors in St. Louis. "This Greek situation isn't good. I think it's going to get worse before it gets better. Probably the same with Spain."

Borrowing costs for Italy rose slightly to 5.76 percent on Friday. The yield on Spain's 10-year bond fell slightly to 6.2 percent, a level that's still very high by historic standards.