First Thread: INTJ what's your defense mechanism?

INTJ what's your defense mechanism? is a thread created by an anonymous user on September 20th, 2014. It is the oldest thread on 16P that can be found. It was discovered by changing the thread number in the url (when already on a 16P thread) to 1, 2, and on until reaching 8, which was this thread. However, given that numbers 1-7 did not lead to a thread, it is possible that there were seven threads before this but they have since been deleted, either intentionally or as a result of a significant site update.

However, there is another thread (5 in the url), titled "The effect of age on your personality traits", which was made visible only to INTPs. It was created on September 17th, 2014. The existence of this thread implies that threads 1-4 and 6-7 could still be up, but only visible to certain personality types.