Please go to your preferences page and make sure your "See Mature Topics" setting is set. Setting it to "Yes" means you see the Mature Topics forum (contains political and religious debates). Setting it to "No" means you do not see those threads.
[font="Calibri,Arial"]I assume it's something like using a different font, or a different colour for your posts except less subtle (well, I wouldn't call some of the colours in use subtle but that's a different matter).[/font]
I never sign my posts unless its for something inspirational or dramatic. The urge could come from emailing frequently, because they require you to be more formal than forum talk. As for me, the people I deal with through email are mostly adults, so I am obligated to show respect. If I didn't, I would't be popular in my Council.