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My Facebook chat bar shows some weird icons, see here:

http://farm8.staticflickr.com/7229/6901848992_4e125573eb.jpg

What has happened to it actually?

Benjamin Robinson
2012-04-06 08:16:00
That has happened to me as well. As far as I can tell, the open green circles indicate is a person has a mobile device connected to Facebook, similar to what used to be a little phone icon next to their name. If the person is actually logged into a computer and on Facebook available to chat, the they will have a full green circle next to their name.
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Callie
2012-04-07 15:12:00
That's what I thought to, but right now I have a friend that I'm talking with on Facebook and she has the little hollow circle... Everybody except 2 people have this little circle :(, oh Facebook...
Tim Gear
2012-04-06 07:33:00
The Green Circles show weather your friend is online and available to chat, if there is no green circle then they are offline or unavailable to chat. 
Susendeep Dutta
2012-04-06 06:27:00
Those icons,if present besides your friend's name can be an indication of their being online.