I don't know what the highest number of posts is, but I do know it's in the 5 figure range...once you get to know some people and you get to talking, it doesn't take long to get your post count up....I joined in 2007 and I went over a thousand this year...only because I'm going on PCC 2.0 and have been posting to those threads regularly since I booked the trip a year ago. Have fun..these boards are wonderful and LOADED with useful information.