Pros
LinkedIn is the best company I've ever worked for. The kitchen is amazing. Gourmet, health-conscious, environmentally friendly, organic food with breakfast/lunch/dinner. The health and wellness class options are great. Good gym. But it's the people I want to emphasize. The CEO is what helps spread the culture. He emphasizes culture. The people you work with are always having fun, and are super supportive. Everyone acknowledges everyone else for their hard work. And I see promotions all the time. There are lots of public thank you emails. And the feeling of inspiration/fun/motivation/hard-work/intelligence is very viral. My friends are completely jealous. But I'm even more jealous of the interns that get to work here. ;)
Cons
...It's really big and I can't get to know everyone??... You're in so many teams at once, and it can get confusing...but you get to go to all the offsites for each team!