The online reviews site had a great first day of trading, but things have gone downhill since then.
Yelp derives the majority of its revenues from local advertising, and the remainder from display advertising, daily deals and other services.
Longtime tech leader IBM has a lot more power to grow than some investors foresee.
The online gaming company is expected to report a profit Tuesday, which may allay concerns about its potential.
Groupon has risen quickly from obscurity -- and its downfall could be just as fast.
It's all about rarity of shares.
But can it control its marketing expenses?
It's all a matter of perspective.
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