Ok ... I don't know which posts LZ refers to by "reconstruction" ... Let me talk about my personal opinion first.
After leaving Baidu Post Bar for a while, I came back to find that Baidu Post Bar has been revised and upgraded, and many new situations have appeared.
1. Renovation of University Post Bar
This is because Baidu has improved the management scheme of Post Bar. Some post bars can't post and reply as before, but can only be classified by class group, such as "Hunan University". In this way, many post bars in colleges and universities have been "rebuilt".
2. Some disharmonious and sensitive posts on political issues will be restricted by authority. "According to relevant laws, regulations and policies, this bar can only browse at present."
For example, "Altay bar"
Then netizens can only continue to discuss and communicate through other post bars. In this case, there may be "reconstruction".
I will link 2007 with a series of situations "due to the rectification and function update of Baidu Post Bar" ... A big reason comes from the restriction requirement of applying to join the Post Bar: the number of posts in the near future (2007 1 1 later) should not be less than 10.
And it seems that the addition of membership functions (such as voting and verification code exemption) began after that.