LinkedIn Prices IPO At $45 Per Share, High End Of Range
techcrunch.com
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For a business like Pets.com (or Amazon, etc....), earnings is what I'd worry about (EBITDA, maybe, but probably just straight earnings). It's easy to sell $20 pet food for $10 and throw in free shipping and get a lot of customers. It's hard to sell $20 pet food for $10 and actually make money doing so.
LinkedIn (Facebook, Zynga, ...) is the kind of business where the most relevant metrics are userbase, engagement, and revenue; it's pretty low per user marginal cost (nil?), and thus scaling userbase, engagement, and getting people to pay something will feed directly into earnings; it's easier to track the sources independently vs. the sink.