Okay I think I found it, looking through the old site news posts.
it was last set to 30 Posts
In order to reduce spam and signature abuse, the first 30 posts are like a try out session for you to see if you like the site. If so 29 posts go by fast. By just saying hello to a few people you will rack up 10 to 20 posts.
After that it is smooth sailing. You can use the chat system, have a signature, and more.
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