Pros: Working at Meta is really good.

Cons: There is a lot of work at Meta.

Pros: Free food. Pay is good. Friendly people (faked sometimes, but not backstabbing in my experience). Free gadgets from vending machines. No real owners on code, so in theory, you can make changes to any team's codebase (it can backfire, though).

Cons: Up or out culture: if you don't get promoted to a certain level in a set time, you're fired. Poor work-life balance due to the up or out culture. If more seniors on your team are workaholics, you are compared against them harshly. Oncall infra can be nightmare-inducing. Again, you must really love what you do and your team if you want to be happy here. It's difficult to move to another team if you get a 'Meets Most' rating in a half. HR won't help you since it's a hard rule (I think it was updated to 2 halves recently).

Pros: Great engineer culture; great autonomy & internal tooling. Many interesting problems to solve.

Cons: Facebook has a terrible public reputation, and many of its policy decisions are questionable. Being so self-driven means that if you don't have a good manager or mentor, you'll need to spend significant effort to try and prove your contributions.