Twitter spends $13 million yearly on food service at its San Francisco headquarters, Elon Musk tweeted on Monday. Replying to former vice president of Work Transformation Tracy Hawkins' claim that the company earlier spent $20-25 per day per person and the attendance was between 20-50 per cent, Musk said that the average occupancy was below 10 per cent. The peak occupancy at the San Francisco headquarters was 25 per cent.