Not a good idea IMO.
Just trying to agree on a top 10-15 would be impossible.
It would also just be confusing if someone had a user name of e.g. Nigel Mansell and a title of Damon Hill.
Finishing points of the previous year? Times the score by ten, so 2560 posts = Seb Vettel, 2520 points = Alonso, 60 points = Heidfeld or de la Rosa... etc. Then change it after each year.