Google+ in new social network created by Google.
One feature of Google+ is Hangouts. Hangouts is group video chat.
Many people have problems witch web cams on linux, this problem also affects GoogleTalk plugin witch is used for Google+ Hangouts and also in Gtalk video chat.
To fix this problem start Terminal and type:
sudo mv /opt/google/talkplugin/GoogleTalkPlugin /opt/goog/talkplugin/GoogleTalkPlugin.real
sudo gedit /opt/google/talkplugin/GoogleTalkPlugin
When Gedit opens paste:
and at last type in terminal:
sudo chmod +x /opt/google/talkplugin/GoogleTalkPlugin
Now restart Browser and enjoy video Google+ Hangouts.