EBay posted a third-quarter profit that beat analyst forecasts Wednesday, but its lower-than-expected fourth-quarter forecast indicated the online auction site operator is not immune from the slowing economy. The San Jose, Calif.-based company's shares fell 54 cents, or 3.8 percent, in after-hours trading, after finishing regular trading down $2.41, or 13.6 percent, at $15.33.

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