Pros: Perks are not on the table to negotiate. They provide any support you need to work better: health, hobbies, education, seminars, clubs, happy hours...

Cons: You may be in a corrupt organization that tries to eliminate you. Do not blame yourself for not being enough. Do not complain; just change your team/organization, otherwise you will be on their blacklist! They try to provide a diverse work environment, but be ready to deal with emotionally less intelligent people anyways. They say "bring your authentic self to work," but it is not appreciated. Be careful.

Pros: They grill you hard in the interview, but once you're in, you get a lot of autonomy and freedom to make decisions about how you think things should be done. Zero bureaucracy or red tape, very few meetings, and people are encouraged to build what they think will work. Two of the common sayings there are "code wins arguments" and "what does the data say?" This means that if people disagree about something, the debate gets resolved by looking at numerical data and/or by building something and seeing whether or not it works. This is a very fast, turn-on-a-dime, high productivity, zero BS environment. It's also a lot of fun to work there. People work hard and play hard.

Cons: The cons at Facebook mostly fall under the heading of "growing pains". Technologically, things move so fast that the layers of the technology stack are often in flux. If you are building a system that depends on other systems at FB, be ready for them to change underneath you. Nothing stays the same for long at Facebook. Every layer of the stack changes, and changes quickly. At the human level, the company has also grown very quickly, which means many of the lower-level managers are new, inexperienced, or got promoted to management for being good with computers (but not necessarily with people). It can be frustrating to report to junior managers and/or people who are clueless about social skills. With that said, the higher-level, more senior managers tend to be really good, and their skill often "trickles down" in various ways.

Pros: Great perks, interesting challenges, dynamic environment

Cons: An open floor plan is not for everyone; it can be hard to concentrate.