I agree, I think it'll probably be down around 3% tomorrow. Most companies tend to provide very conservative estimates, it's really not that unusual. A company famous for it was apple. Even in it's heyday appl used to give extremely low end expectations.
the fundamentals will show that lnkd is overpriced, but this is a name that many institutions want to own in their portfolio. The p/e is insanely high I know, but so is FB, AMZN, NFLX, and others. Good move on shorting it at 200 though. Wish I did the same. It has had a big run up since last quarter.