I'm not sure if this is a known bug, or not, but I highlighted a section of scripture this morning, right clicked it and chose the share on Facebook option. The proper interface came up, once I logged in and filled in the comment section, then I had the ability to share or cancel. I clicked the share button and from that interface nothing appeared to happen, so I clicked it again with no apparent change. I then opened up my Facebook page and it has been shared twice. IMHO the interface page should give some indication that the share was successful.
Mac 4.6 Beta 1 default browser Chrome Version 20.0.1132.57