We were expecting this after it was announced Google bought over Meebo, but here's final confirmation.
Of interest to librarians, Meebo Messenger, Meebo Me, Meebo Mobile Apps will be shutting down July 11th, 2012. All embeded widgets will stop working and you can download all chat logs at https://www.meebo.com/chatlog-download by July 11, 2012.
For more details see http://www.meebo.com/support/article/175/
Meebo Bar will continue but I don't think many libraries use it. Meebo Me widgets of course are used by many libraries to provide IM reference support.
Or perhaps in the age of Skype, Google Hangouts, SMS ref, Twitter & Social Media, IM reference is no longer so necessary?
Are you impacted by the closure of Meebo? Let us know in the comments.