Some of this is pure short squeeze. The shorts treated Zillow as a housing play and bet that it would go down with the homebuilders and Realogy. Turns out it is a kind of social, mobile and cloud play that's viewed as a remarkable success.

I think Zillow is overvalued. But like Yelp and LinkedIn, as well as Netflix ( NFLX) and Amazon ( AMZN), it is loved. Realogy might be undervalued and is hated.

Shorts: Be careful what you bet against. Zillow isn't a housing play. It's the latest and greatest use of the Web!

At the time of publication, Action Alerts PLUS, which Cramer co-manages as a charitable trust, had no positions in the stocks mentioned.

Just Being a Realist Here

Posted at 11:05 a.m. EDT on Tuesday, Aug. 27

Every time you produce energy, you hurt the environment in some fashion. Any time you extract fossil fuels from the earth, you get a hazardous reaction. That's why I wasn't shocked to read still one more negative story about the hazards of fracking, and how it's causing tremors in the Eagle Ford shale as oil company after oil company discovers more and more fuel in the ground -- 600,000 barrels per day, to be precise.

Now, I am not saying that earthquakes and tremors mean nothing. They need to be monitored. I am not saying, "I love fossil fuels and I think we should drill, baby, drill."

I am just being a realist. We need to get our energy from somewhere. No one's ever satisfied about the side effect. Birds are killed by windmills, fish by hydroelectric dams, desert life by solar panels. Coal causes black lung. Nuclear? Think back to Fukushima. Oil and gas? Ethanol raises the price of grain to levels that cause severe economic pain among the less well-off. It also uses up another precious resource -- water -- as it takes tons and tons of water to make this product that nobody seems to want to use anyway.

It's a fact of life.

Now, we know the U.S. could decide that all it wants to do is import oil and gas from other countries, and thus make our nation more pristine and less prone to earthquakes. But doesn't that have consequences, too? Much of the oil we bring in would have to be from the Middle East, and the countries that produce it there often have grave ideological differences with the U.S. Their oil money has, at times, been used to finance terrorism.

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