Im trying to get into the blue building. Just need 100 forum posts to access it. Does writing on my post in response to others count?

Responding to others on a thread will count, but creating a new thread doesn't. I would recommend checking out the user-run games forums or the threads in Games where people post what they got from a daily activity like the Rift or Ikumoradeekanox tree, since those are pretty simple posts to make without spamming c:

Thank you!!!