Is there any way for users to delete posts? I did a search "Delete Posts" and found that lots of people either create a post at the bottom of their thred that says "I no longer need this post is there a way to delete it?" If not do they simply expire after a certian amount of time?
mark your question as "answered", but this is as far as you can go. You can try asking a moderator, perhaps though a private message, to delete it, but I really don't know if this will produce the desired effect.
Depending on several factors, it might, but then again, it might not.
In several product fora, we often see OP's asking that a thread be "closed," or "deleted." The problem with fulfilling such requests is that there is often good discussion, that can be very useful in the future. When used with a Search, many problems can be handled, without ever posting again. If that post is deleted, part of its potential to help will be deleted, as well. In those cases, we recommend that the OP just mark it as Answered (and that all points go to me... ).
Now, some posts probably should be deleted, but that is a task for the MOD's. Most do not take a pro-active role in this, unless the OP requests it, but then some do fall very far from the guidelines in the FAQ, so might bite the dust, with no request from the OP.