The first question is; It seems members can rank up without even getting a Karma. If it's possible to rank up with activity only, what karma is required?
Or maybe I am wrong? We need more detailed information about ranking up. What karma stands for and why it's important. Does it affect my ranking?

The next question is, Is it possible to check who gave you positive Karma and who gave you negative karma, and for which post? Just like the merit system on BitcoinTalk? Because if someone has a group of friends, they can send positive karma to each other and if there is no way to check, it's abuse. The opposite thing can happen too. Let's say I have too many enemies and they started to give me negative karma just because they don't like me.

I appreciate admin's feedback!