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Why do we care? Are we becoming Wall Street traders and "analysts"?

What use is reporting or reading about stock movements within a day?

In case you're not actually trolling, here is why.

Because a change in market price reflects a change in the midpoint of opinion of people on the future value of Facebook, who are willing to put their money where their mouth is with regards to their opinion -- these are not the opinions of idle chatterboxes.

As such, stock price movement in response to news is a very valuable critique of a company's actions. A change in stock price is arguably more objective and valuable information than any random blogger or columnist whose opinion might be published here on HN.

Does that make it clear?

Buy on the rumor. Sell on the news.

Or as some brokers call it "sell into strength".

It's about profit taking and has nothing to do with "critique of a company's actions" or objectivity.

FB after-hours price now down a little over 2%.

>willing to put their money where their mouth is

Surely not THEIR money. Someone else's money, with a fee for "expenses"

Because it adds to the cost of the acquisition. If their market cap goes down 5% as a result then that's an extra cost of ~$8B, for an overall cost of $27B.

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