“candidate must have social skills”
The Futility of (Narrow) Speculation About Machines and Jobs
Adam Elkus

I disagree with this at a literal level (I agree with the premise of the post). While there may not be many job ads which explicitly list this requirement, there are plenty with variations on the same theme. “Outgoing”, “bubbly”, “confident”, “a team player” are all other ways of asking for social skills — these are very commonly found in job ads.