Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: LinkedIn (Nasdaq: LNKD) popped 13% in intraday trading today after four investment banks initiated coverage with positive ratings.

So what: Underwriters Morgan Stanley (NYSE: MS), JPMorgan Chase (NYSE: JPM), UBS (NYSE: UBS), and Bank of America Merrill Lynch (NYSE: BAC) initiated coverage with largely bullish reports. Price targets were $88 at Morgan Stanley, $85 at JPMorgan, $90 at UBS, and $92 at B of A Merrill, well above yesterday's close of $76.38.

Now what: Are these underwriters influenced by the fat banking fees they received for taking LinkedIn public? Evercore Partners (NYSE: EVR), which didn't help underwrite the IPO, initiated coverage this month with an equal-weight rating and a less bullish $70 price target. At least JPMorgan warned that the stock could be worth only $60 if economic conditions deteriorate and the job market slows. With consensus EPS of only $0.51 for 2012, it may be time for investors to delink from LinkedIn.

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Fool contributor Cindy Johnson does not own shares of any company named above. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.