Today's Twitter segment of "Where The Money Is" answers a tweet from Bloomberg News, which calls short-sellers "self-serving, nutty and often right." 

Short selling can be terrifying -- in theory, you can lose a literally infinite amount of capital. But short sellers serve a valuable function in the market, correcting for irrational exuberance and keeping stocks priced reasonably. 

In the following video, Motley Fool energy analysts Taylor Muckerman and Joel South discuss this tweet, and two of the most heavily shorted stocks in the solar sector -- SunPower (NASDAQ:SPWR) and SolarCity (NASDAQ:SCTY.DL).