"5 Google Opt-Out Settings"

From Information Week, a list of 5 settings to check if you use Gmail or Google+.

1. Opt out of Google+ email changes

If you don't want Google+ users contacting you, opt out by by visiting your Gmail settings page and click the General tab.

Find the setting "Email via Google+" and click the dropdown menu. You can choose to receive email from anyone on Google+ (the automatic setting), extended circles, circles, or no one. Select your preference and click Save Changes at the bottom of the page. ...

2. Delete your web history 

Unless you consistently delete it, Google tracks and logs all your web history ...

3. Opt out of Google+

When you sign up for Gmail, Google automatically gives you a Google+ account. If you're no longer using the social network, or if you just don't want it, you can delete it. 

Start by navigating to your Google+ settings page.

At the very bottom is the option "Disable Google+." Google will show you a list of data that will be removed if you delete your Google+ account. This includes your posts and comments, your +1s, and your public Google profile. If you consent to what information remains and what is deleted, check the box at the bottom and click "Remove selected services."

4. Opt out of shared endorsements 

... To opt out, visit the Shared Endorsements page in your settings and scroll to the bottom. Uncheck the box that reads, "Based upon my activity, Google may show my name and profile photo in shared endorsements that appear in ads." Then click Save.

5. Opt out of YouTube messages and video sharing ...