I have noticed that some people, for whatever reason (God only knows) join this website just to post comments advertising some website or other. Many times they try to make it look like they are actually commenting on an article or something, but the comment is usually something like an astrological forecast: generic enough to apply to anything ("nice work," "this really helped me," "great article", etc, etc)! They have to go way out of their way to do it, because there is a system in place to make sure only a human being is joining. They are wasting their time and mine, but I actually enjoy deleting spam and their associated users.
I would change the settings here to make comments subject to approval, so as to not even give the spammer the satisfaction of seeing their comment posted for even one minute, but this isn't fair to regular users who expect to see their comment posted right away. And with this Drupal system, the comments module is tied into the forum module. When you reply to a forum post you are actually also making a "comment." So for now I'm keeping it the way it is. I will delete spam posts as fast as humanly possible, as I care about my website.
So, spammers: if you join and you post spam, don't wonder why you can't log in under the same user name anymore. You've been deleted. As for you non-spammers, decent human beings one and all, keep the "nice" comments coming, as I do appreciate them!