Pros: - Fast-moving culture. - If you join a good team, you can ship features pretty much immediately. - Not much bureaucracy. - Very smart people. - Good engineering culture.

Cons: - You are forced to dogfood/test a lot of internal FB products, which can be okay, but sometimes constant crashes get annoying. - Less bureaucracy means that things are likely to break a little more often. - People talk about politics (e.g., current election, social issues) quite often.

Pros: Many teams, easy to find an interest area.

Cons: Hard to establish ownership within a team.

Pros: Facebook has a lot of awesome people working there to solve interesting problems at scale. They have over a billion active users a month and a lot of smart engineers working to keep their software great. The benefits and pay are obviously great, and since it's a well-known company, it's a good place to start if you're looking to get recognized at other tech companies and startups.

Cons: If you're looking to solve "new" problems and build new things, Facebook is probably not the ideal place for you. They occasionally work on new features, but a lot of work is put into improving or rehashing what they currently have. This is what I spent most of my time on while I was there. It was still pretty fun, though. Facebook sometimes claims to be a startup, but it's not in most aspects the average software engineer would be concerned with. While engineers do have access to a lot of information and code, the company is too big for one person to have a major impact on product or engineering decisions.