You are when your job requires you to sidestep your morals.
That doesn't bother me. I still go to the pub after work with friends and have a good time.
Media are the information sourcing and feedback loop for societies. The print media went through its crisis of awareness in the early 20th century. See especially Lippmann's Public Policy.
There are differing levels of how strongly I feel about certain moral values I hold. For example, working for a company that dealt in wholesale killing of others is obviously worse than working for an advertising network. Would I work for doubleclick for $1M a year? Hell yeah. Would I spy on citizens of my country for the same amount? No.
Does that make me not have morals? I don't know.
'Peer' is very flexible. This could be a comparison to people the same age in other careers.
Also, keep in mind that Facebook engineers are constantly surrounded by other Facebook engineers so their SE peers probably do approve. They collectively don't think Facebook is a problem so they implicitly approve of each other.