RA-Plugin enables you to zopim chat widget in your website.
I installed the plugin on multisite, activated on a single site, copy/paste my Zopim Chat code (i.e. Embed Widget code), cleared site cache, and website went down (blank white screen).
On the plugin settings page, it said Facebook, which was confusing.
Also, I noticed that when I saved my plugin settings, it said settings were saved but it looked like the text box was empty still.
Deactivated plugin, deleted plugin, cleared site cache, and site was back to normal.
Plus, why use this plugin when the official Zopim plugin is here: http://wordpress.org/extend/plugins/zopim-live-chat/