How to send a facebook chat message when your computer is switched off?

Sometimes I sign into facebook and I see that someone has written me a message on fb chat while I've been offline. I can't reply, because by then they are offline. How come they can send me a fb chat message when I'm not on facebook and my computer is switched off?

Because the message sits on Face Book's servers till such time you next log on.

No different to your emails. Someone sends you one and it sits on the servers until
such time you retrieve them.

How to Enable Facebook Chat in Messenger 2011latest version ??

One of the most interesting additions to Messenger in its recent Wave 4 Beta refresh is the ability to chat with your friends on Facebook right from within Messenger itself. Chris Jones, Vice President Windows Live Engineering, called this new connection a significant task. Yet, how can you combine your Messenger and Facebook contact lists? Follow this how-to:

1. Browse to http://profile.live.com/Services/Add.aspx?appid=1140906031.
2. Activate the check box Chat with my Facebook friends in Messenger.
3. Scroll down and click Connect with Facebook.
4. Grant Windows Live permission to access Facebook Chat on your behalf.
5. Sign out and back in to Messenger. Your Facebook friends should now appear in the Facebook category.

How to add Facebook chat to Google Talk?

Gtalk does not offer a direct and easy way to configure transports. You must download http://psi-im.org/ intall and configure your google talk asi if you will use to chat from this software. If you not figure how to configure a Gtalk account on PSI, follow the instructions they give on the site. Next when Gtalk is logged, in the contact list go to GENERAL menu, choose SERVICE DISCOVERY, and jot down some server like jabme.de, fsinf.at or any Jabber open server that supports transports. Next, in the list choose XMPP transport, double click and enter your Facebook login: yourusername@chat.facebook.com and your facebook password. Login. Look in the PSI contact list if you see XMPP.[the_server_you_choose].[something] If you can see it there and logged in, just close PSI and open Google Talk. Facebook is alredy added to Google Talk .

Facebook turns off chat system due to security lapse

Facebook shut down its chat system yesterday after it emerged private conversations were visible to other users.

Any user was able to view the live chats of their friends, as well as their pending friend requests, until the social media site was alerted to the problem and took Facebook chat offline.

The glitch, reported by technology blog TechCrunch, meant that people clicking on the "Preview my profile" button – which enables users to see how their information is shown to certain friends – were given information from their friends' accounts.

The world's biggest social media network has been under scrutiny over fears its new system, which opens up users' activity to other sites, makes it too difficult to keep information private.

"For a limited period of time, a bug permitted some users' chat messages and pending friend requests to be made visible to their friends by manipulating the 'preview my profile' feature of Facebook privacy settings," a company spokeswoman said.

"When we received reports of the problem, our engineers promptly diagnosed it and temporarily disabled the chat function. We also pushed out a fix to take care of the visible friend requests which is now complete. Chat will be turned back on across the site shortly.

"We worked quickly to resolve this matter, ensuring that once the bug was reported to us, a solution was quickly found and implemented."

The company issued a statement on the Facebook fan page explaining the absence of the chat feature to users.

"Chat is unavailable as we work quickly to fix a bug reported to us," it said. "It should return to normal soon … We apologise for the inconvenience."

This morning nearly 5,000 people had said they "liked" Facebook's comment.

Facebook Chat Now Available Everywhere To Everyone

David Reiss announced thatFacebook Chat Now Available Everywhere To Everyone .
and here some of his words.
" WE believe you should be able to connect with your Facebook friends everywhere. We're happy to announce that now you can with Facebook Chat. Starting today, the more than two billion chat messages sent on the site every day can be sent from your favorite desktop instant messaging client.

By integrating Facebook Chat with your preferred instant messenger, you'll never miss a message when you have to navigate away from Facebook and you'll be in control of how and where you chat with your Facebook friends. Simply connect your Facebook account with the instant messaging client of your choice and start chatting. You will not need to stay logged in to Facebook.com to continue to access your Facebook friends.

If you don't want all of your online friends to appear, you can adjust which Friend Lists show up in chat by adjusting them on Facebook. To go offline, you can either close your instant messaging client or click "go offline" in your Facebook Chat options. As always, your conversations will remain completely private and only between you and your Facebook friends.
To make Facebook Chat available everywhere, we are using the technology Jabber (XMPP), an open messaging protocol supported by most instant messaging software, including iChat, Pidgin, Adium, Miranda and more.

We've also built support for Facebook Chat into Facebook Connect for developers wishing to build chat experiences into their website, desktop or mobile instant-messaging applications and services. If you already have an AOL Instant Messenger account, you can check this out by connecting your Facebook Chat using the latest version of AIM.

To get started chatting, please visit the Facebook Chat section of the site tour for instructions on how to connect and for examples of instant messaging clients you can connect with. We hope you enjoy chatting with your friends wherever you go."