I've been meaning to check this for a long time, and finally got around to it. The numbers that Posterous displays for views of their posts have always seemed too high to me. I had installed Google Analytics on the site a long time ago, but I've never really checked them. I was looking at another of my sites today and decided to take a look. I used a post that was a over a year old for the comparison. Google shows the number of views as 654. Posterous shows the same post has been viewed 4013 times.
Either one of them is wrong, or their not measuring the same thing. That said, there is nothing being measured by Google for that post that even comes close to 4013. What's up, Posterous?