If you look at any post you've made, on the left, under your name is your title.. it lists Member since: mm/dd/yy and under that is Posts (# of posts made, which your title is based upon)

The information is updated with each post, and is not a static note. (My meaning of that is, you can't look back to see what your 1000th post was, to whom, etc, because all of your posts carry the current total number.)

TC!