Reporting back in 1990, the authority said air traffic in the south east of England would reach saturationpoint by 2005 and suggested extra runways were needed at one of London's airports, with the best option, in terms of costs to passengers, a third runway at Heathrow.
Having noticed adverts becoming more prominent in both the new newsfeed and in Facebook's various mobile apps, I wanted to know whether Ms Sandberg thought there was a danger of users reaching saturationpoint.
Facebook is under pressure to keep growing, but the company is rapidly approaching a saturationpoint with the adult population of Internet users in countries in many markets.