jar_cup_bowl
We have a take-home assignment as part of our interview process and they were able to get a working solution, but missed on design patterns that would make their code more maintainable and extensible, things that are usually learned from code-reviews by people who have had the experience of working with bad code.
This was more common in candidates who came to us from the tech departments of non-tech focused companies.
We lamented not being able to hire otherwise smart and personable candidates, but at the end of the day we only had headcount for 1 employee and we went with a different smart and personable candidate who had better early career opportunities.
Everyone knows thats facebook's whole business model and they aren't shy about it. If you're developing an app that collects personal data, its in your hands to make sure its shared appropriately.