Spectators Balcony (Spotters Corner)If you're not a professional pilot but want to discuss issues about the job, this is the best place to loiter. You won't be moved on by 'security' and there'll be plenty of experts to answer any questions.
As far as I know it was just someone asking if there were any more UBAS (or BUAS) people using pprune. Most of the replies were from people from other UAS's though.