it means they're idle (away etc.) like on msn when they have a clock its the same thing for facebook chat except its a moon, however you cant choose to be idle you only have the option to be online or offline and if your online and you havent done anything for a while on facebook chat it automatically puts you to idle seeing how your online but not doing anything, hope that answered your question!
To be idle on Facebook, you have to be logged onto Facbook but not have done anything for about 15 to 20 Minutes.
It means that the person is still logged into Facebook, but is idle (hasn't refreshed the page or made any actions on facebook) in the last 5 minutes or so.
Facebook!!!
no but you can make it seem as though you are not logged on to facebook by clicking "i am not online" on the bottom of the screen.
Not be logged into facebook or not be active for ten minutes then it shows a moon
You mean seem as if you were logged on?? OR Go in the closet and check your facebook
just press the sign out button at the top of the Facebook page and then your logged out.
When you are logged in on Facebook, you can look at all of your applications, and choose to block Farmville.
You really can't play without being logged into your Facebook account because it's with Zynga and that orginated on Facebook.
You don't really "play on Facebook"; you just associate a Facebook account with RuneScape. After that, if you are already logged in into Facebook, you can select RuneScape from there and don't need to login again.
Stalker Check is a FaceBook app which will work on a Mac which is logged into a FaceBook account.
Facebook is the most popular site.