If you didn't read old post long ago meebo was severed from the gaia parts
Lol. No it's not.
The Meebo Bar will continue to be available to site publishers and will see continued improvements and new features in the weeks and months ahead.
You should read the Meebo Support article Only Meebo Messanger and other products are removed, the Meebo bar still stands. This just seems to be a reoccurring issue for primarily Chrome users, often clearing cookies will resolve this, but sometimes it does not.
As I have not have this happen, I cannot fully investigate the cause. Often though, users say they minimized Meebo and then it vanished.