The Meebo bar app has been deprecated by Meebo and no longer functions as of June 6, 2013.
You may find Meebo's official announcement at https://www.meebo.com/
The app will be removed from the Webs app store and installation of the app will no longer be available. You may uninstall the app from your app store under "My Installed Apps".
Please note: If you have a third party online or social toolbar provider who provides custom code to use in the place of the Meebo bar, you can add that code to your site through a custom HTML module. You can find a quick guide on how to use a custom HTML module here: https://webs.zendesk.com/entries/21658651-Customization-HTML