Well not exactly a short.

LOL
I do day trading.
I buy it and watch it daily and set points where to avoid a loss. I am up over 225% so far in just 3 months of trading. I did mad day trading several years ago and now going back to it.
Most guys lose by simply not setting sell points on a stock.
I guess it does not count as a short per say by definition as I said above though.
I just did buy at open and during the climb and sold off as it dropped.
I urged a strong buy on LinkedIN before the IPO on GFY it was an IPO I looked forward to and I was certain it would climb rapidly and then get a hard drop. I was right

As usual. Thats how most strong brand IPO's go especially tech/internet IPO's unless they suck.
Long term I really think LinkedIn will stabilize but its going to be a good 6-12 months before it gets 1/2 close to what it was on the peak of the IPO. Expect somewhere in the middle. If you catch wind of a buy out or take over of LinkedIN buy it again. I doubt Google would buy it but I am thinking Microsoft might take an interest but those are things that won't play out for another year or two or even five. I could see Facebook interested in LinkedIN.
If ya want a good solid tech investment think BlackBerry ( Research In Motion ) these days its takin a small fall and I think its good right now.