Please follow these steps to let people authorize on your site with their Google accounts.
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1. Go to the Google Developers Console.

2. Create a new project:

3. Go to the Library > Google+ API > enable Google+ API.
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4. Now go to OAuth consent screen and insert data about your site:

4.1 If you need to change the logo, then be prepared for the fact that it will have to be verified by Google.
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5. After that, return to Credentials and generate an OAuth client ID:

6. You will be asked to indicate the following information:

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Authorized redirect URIs are: https://sitename.com/users_connections/oauth_login/3/ and https://sitename.com/admin/social_networking/oauth_active/3/1/

7. Copy the OAuth client ID and client secret:

8. Insert client ID and client secret in your site’s control panel under System > Social networks > Google > Application (/admin/social_networking/application/3/):

9. Finally, click the No button to initiate the connection: