This is your chatboard.
Because you're 14, your privacy setting automatically have it set to "friends only", which is cool. I haven't seen anybody abuse any chatboards yet, but I'm sure once Xanga grows some more, you might see more of that... stuff like spammers posting advertisements on your board.
Anyhow, I just learned this myself, but you can answer people's suggested questions by posting to their chatboards as well as leaving them comments.
Cheers! ^_^
Chatboard (1)