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The Wall Street Journal reported Tuesday night that Facebook’s chief financial officer, David Ebersman, decided shortly before the stock debut to raise the number of shares the company would offer by 25 percent. The Journal, citing people familiar with the planning of the stock offering, also reported that Morgan Stanley had assured Ebersman there was plenty of demand for the stock.

A spokesman for Facebook Inc., which is based in Menlo Park, Calif., said late Tuesday that the company had no comment.

The SEC had already said on Friday that it was looking into problems surrounding the IPO. On Tuesday, the agency’s chairman, Mary Schapiro, said: “I think there is a lot of reason to have confidence in our markets and in the integrity of how they operate, but there are issues that we need to look at specifically with respect to Facebook.”

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AP Technology Writer Barbara Ortutay and Julie Walker of AP Radio contributed to this report from New York.