That will get your account banned as posting addresses is against BT policy. Do it on your own forum
Posting tx ids or hashes isn't afaik.
Since people have to send 1 NXT from the account the asset should be issued to anway i don't see a problem.
Thanks for mentioning it though.
It has nothing to do specifically with posting addresses, tx ids, or hashes. Addresses is just the most common type of spam we're trying to stop. The basic rule is that
you should be not be requiring people to post in your thread, period. This is a discussion forum, and that just leads to spam that makes discussion near impossible.