What you did was neat.
For the ratings and posts per day lists, you might want to use a minimum number of ratings or days as a member. Otherwise, someone with a single 10 rating would be at the top of the list or someone who posted 60 messages in their first day as a member would be at the top.
The word "less" in the following should be "fewer."
<< Number of users with 0 or less posts: 18114
Number of users with 100 or less posts: 54525 >>
The word "amount" in the following should be "number."
<< Users with highest amount of Posts-per-day:
>>
The word "least" in the following should be "fewest."
<< Countries with least users:
>>
You use the words "more" or "less" to describe quantities of things that cannot be discretely counted like love, anger, pain, etc. For things like message board posts, cars, people, etc, you can use the word "fewer" to quantify them.