You may talk about anything here, as long as it's G-rated. If you have something a little less innocent to talk about, post it at the Big Kids Only board. Topics like that include everything listed in the forum rules.
If you aren't sure if your topic is safe, post it to the BKO board anyway.
Other than that... Just, please think before posting, okay? There are good posts, and then there is spam. (For example, if your thread doesn't seem like something that would be especially discussion-starting, it's probably spammy... Also, one or two word responses to posts are spam about 99% of the time.)