why does facebook still show those online but doesn't want to chat?

i get that alot and facebook should do something like that and i figured out its beacuse facebook chat system isnt stable like it use to be beacuse of the mass incress of population anyways . Facebook staff will figure it out in due time ritchelle hope u have luck with facebooks dificult system -Dylan

Like the first responder said: Maybe they're busy and don't want to be distracted. I myself often mark myself offline when I'm doing something important, since Facebook annoyingly changes my active window whenever someone sends me a message. It's really annoying when Facebook does it while I'm talking to someone else on a different site, or playing a game. Anyways, I guess Facebook just wants to make it easier for stalkers to know what their friends are doing. Even if you can't talk to them, you'll at least know that they're online. :3

When you logged in to Facebook, the chat section automatically opens. If someone disables you, perhaps there are other things that they are doing and would not want to chat. Perhaps they could be playing pet society. I know that it is rude to just disable you. Maybe the next time you see that person, ask her why she disabled you. Possible, the Facebook system is not functioning well.