SAN FRANCISCO — LinkedIn Corp.'s first-quarter earnings report will show whether the online professional networking service has been able to sustain the rapid growth that has wooed investors since the company's stock market debut nearly a year ago. WHAT TO WATCH FOR: The results, due out after the stock market closes Thursday, will be the latest litmus test for LinkedIn's shares, which closed Monday at $108.45 — about 172 times its projected earnings and 13 times its projected...
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