I created a KB article that mentions the 50 post rule for new members http://silkroad5v7dywlc.onion/index.php?action=kb;area=article;cont=33 Also, yes, we implemented this to control the spam on the forums. Being on TOR and everyone sharing the same IP does not allow us to ban/restrict individual users by their IP, so it is difficult to control the bot accounts that are created for the sole purpose of spamming and advertising on the board. On the previous site each forum use to be overran with hundreds of spam post daily and it was out of control. This is one of our mechanisms we can use to prevent that from taking over the forums.