Pros: High impact job; each change touches millions of people. High ownership; there's too much to do. Smart people to work with. Great food and perks. Low management overhead. Lots of interesting problems to work on.

Cons: Long hours and hard work can be exhausting. It's very chaotic, plans can shift quickly, and you have to be very flexible. Other than that, there's nothing else.

Pros: Fast-paced, which makes it prime for growing quickly as an engineer.

Cons: Everything always is broken.

Pros: - Opportunity to write software that gets used by hundreds of millions of people - Opportunity to see how a successful company is run - Opportunity to launch often - Potential IPO

Cons: - Frontend work (i.e., work done in most of the product-oriented teams) is mostly mundane PHP and nothing intellectually challenging from a Computer Science perspective. (Backend may be different, but I never tried that.) - Potential to get judged too quickly for performance. They are less willing than other companies to let you try something different, which may be a better fit if you are not performing well enough on your current project. - Chaos that may hurt you: you may start out on one project but be expected to do something else for no good reason, that may not be the best fit for your skills. - Some managers are too busy to give useful, frequent feedback. - I get the impression that they manage by a bell curve but are not being transparent about it.