LinkedIn ( LNKD ) retraced 4% yesterday and broke below some key moving averages, including the 50-day yesterday. This one has shown relative weakness since its most recent earnings report, which was a rare disappointment for a company that had made a habit of beating Wall Street expectations. The positive results had made the stock a momentum darling, but I think the narrative has now changed. The $165 level is the last line of defense to keep it out of trouble, but I think if you are looking to add some shorts on today's down open--which could be tricky--this is one of the best short set-ups out there.