I just removed three individuals who have recently applied because they did not respond to their Welcome Post. As stated in our rules on our userinfo page, and as stated on each post that goes up, you must reply in order to remain members of the community. This rule is in place to help us cut down on the number of trolls and other nasties who may apply to the community. We take this very seriously, and we do give you up to a week to reply to the post. If your name is listed in the week's Welcome Post, you must reply within a weeks time before the next post goes up, or we will remove you from the community. I do not like seeing people go through the effort of applying, only to have to remove them because they did not abide by this rule. Again, we have this rule in place for everyone's safety in posting, it is not just something we made up to see people jump through hoops.
If you find that you have been removed due to lack of responding to the Welcome Post, you have one more chance to apply, and be accepted. After that, should you fail to respond to that next week's post, you will be removed and not allowed to apply again.
As an added note, if you are approved sometime after the Weekly Welcome Post has gone up, your name will go in to the next Welcome post. So if you don't see your name on the post, don't worry about replying. Also, don't worry if you've been a member for a while. This is just for new members who have recently been approved and whose names are listed in the Welcome Post, though anyone is welcome to jump in and say hello to our new members. :)