Matthew C Klein, Columnist

Guess Which Social Network Is Overpriced

Social networking companies are in a zero-sum competition for people’s attention. That suggests an limit on the market valuation of the sector as a whole.
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Will boredom burst what looks like a bubble in social-media company valuations? It sure seems like it's possible.

As for whether there is a bubble, a new survey of Bloomberg subscribers found that 82 percent of traders, analysts and investors think there is. Here's the conundrum: Each company's valuation only makes sense if you assume that it will emerge as the dominant player. Of course, that's impossible.