Pros
The people are high caliber and the sort of people that you want to hang out with. The company culture is clearly defined and lived daily. Things like 'Do the right thing,' and 'take intelligent risks' and 'act like an owner' are key company values. I really like and respect my colleagues. Management is top notch- some of the most talented execs in the Valley. It's an honor to interact with people like Jeff Weiner, Reid Hoffman, Deep Nishar, Allen Blue, etc., etc., etc.- people that I would pay to hear speak at a conference. I've heard stories for years- before and during my time here- about how LinkedIn products positively impact people's lives. It feels great to be a part of something that has a profound impact on many people's lives. What LinkedIn does matters.
Cons
The company is growing rapidly, so things aren't always clearly defined. If you don't like an agile work environment & company, you may want to consider a bigger, more static company. I thrive in a dynamic environment. However, some people don't.