Settings - Google+
On this tab, you can adjust settings related to Google+ services. These settings are currently needed only for one web part: Google+ activity feed.
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 General  | 
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 Client ID  | 
 Key obtained during the authorization of API access on Google.  | 
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 Client secret  | 
 Key obtained during the authorization of API access on Google.  | 
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 Access token  | 
 Click the Get button to obtain a site-wide access token required to execute Google+ API calls that require authorization. The Client ID and Client secret fields must be filled in.  | 
To obtain these keys, create an account at https://accounts.google.com, create a new API project at https://cloud.google.com/console and authorize it on the APIs & auth -> Credentials tab.