How should service workers be organized? Trade unions and their tactics don't really work...

That's where sabotage comes in. For Fedbook, some dev could bang out some malicious code that fucks something up and hide it in a weird spot. Code can be extremely difficult to sort through if it isn't organized properly. I don't know dick about FB specifically, but they must have a company standard formatting for their code. Most people get used to their company's format, and that can be exploited to make the problems harder to find.

they should be replaced by machines