When BZPower went down, I would have paid a lot of money to keep all of my posts and replies, as well as my comics topics. So this functionality is for those who like nostalgia, I guess.
Your PMs have always technically counted as posts. PMs are essentially private topics that only those involved with them can see. So your post count includes those in PM. I hope that can change in the future, but as of right now the board doesn't have that functionality to treat them as different things yet.
Your Kindle emojis are specific to your Kindle device. The majority of the users on these boards do not have Kindles, and Kindle has trademarked their emoticons. To solve this, a universal free emoticon system is used on the boards.
We don't like them. There might be changes to how some of those look pretty soon.