NEW YORK (Reuters) - The S&P 500 and Nasdaq notched their eighth week of gains in the last nine, but momentum ran out on Friday as shares ended the day lower after a thinly traded session. The Dow Jones industrial average dropped 2.73 points, or 0.02 percent, to end unofficially at 12,977.57. The Standard & Poor's 500 Index shed 4.46 points, or 0.32 percent, to finish unofficially at 1,369.63. The Nasdaq Composite Index fell 12.78 points, or 0.43 percent, to close unofficially at 2,976.19. For the week, the S&P 500 advanced 0.3 percent and the Nasdaq gained 0.4 percent. ...

Yelp's stock opened to five-star reviews from investors on Friday, soaring 63 percent even though the company has yet to prove it can make money from its online recommendations.

Yelp's stock opened to five-star reviews from investors on Friday, soaring 63 percent even though the company has yet to prove it can make money from its online recommendations.

Yelp's stock opened to five-star reviews from investors on Friday, soaring 63 percent even though the company has yet to prove it can make money from its online recommendations.