I am noticing a fall in forum traffic by as much as 20% per month when compared to the same month of the previous year. Our forum is well established (8 years) and quite big (50K post per month). I am interested in doing some benchmarking with forums of similar size to determine how much of the traffic fall is due to new forms of social media. Ideally I would like to swap stats with non-competing forums under NDA. Any takers?