When you +1 a post in google+, people in your extended circles (By default) may see this +1d post in their home stream. You can easily hide or customize who can see your future +1 activity updates by changing your visibility settings.
Also Read : How to hide google+ profile from google search results
Keep track of your +1 activity on Google+ by visiting your Activity log.
Watch Video Tutorial : How to Control +1 Activity in Google+ Stream
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