MadProfile was founded in 2002, and was once the premiere in-app AIM (AOL Instant Messenger) profile extension ("Mad" as in unlimited/unrestrained/zany/boisterous)...
MadProfile leveraged a little-known feature of the cut-down in-app browser (which did not appear to be a brower or have web functionality) to load one's "MadProfile" page inside the desktop app itself -- circumventing the imposed charater limit while remaining in the standard desktop app interface, and allowing certain otherwise-impossible interactive components within the limited profile viewer. At its peak, MadProfile had over 1 million registered users!