LinkedIn Corp. earnings and revenue soared in the first quarter, but its outlook for the rest of the year disappointed Wall Street. LinkedIn earned $22.6 million, or 20 cents per share, in the first quarter. That’s up from $5 million, or 4 cents, a year earlier. But investors turned sour on LinkedIn’s forecast for the current quarter and the full year. The company said it expects revenue between $342 million and $347 million, short of a $360 million forecast for the second quarter.