About the +1 button
+1 is how you signal your appreciation for anything that grabs your attention on Google+ or on your favourite websites. When you read a post that makes you want to cheer, +1 is your applause; when you watch a video that has you in stitches, +1 is your laughter; when you see a photo that captures that special moment perfectly, +1 is your 5-star review.
+1s on Google+When you +1 a post on Google+, the creator of that post and the people with whom the post was shared can see your +1. The creator of the post will receive a notification that you +1'd their post. If the post was shared with people in your extended circles who also have you in their circles, they may also see your +1 in their streams.
To remove your +1, just click the +1 button again.
+1s outside Google+
When you +1 something on a website, your +1 will be added to the total number of +1s shown in the count. When someone who has you in their circles views content that you've +1'd, your +1 may be highlighted next to the +1 count. +1s are public, so a good rule of thumb is to +1 pages only when you’re comfortable with sharing your recommendation with the world.
Once you've +1'd something on the web, you can share the content with your circles on Google+.
The +1 tab
All of your +1s are collected on the +1 tab on your Google+ profile and will be public, if you decide to show the +1 tab. You can choose which information you share on your profile.
To view this tab, visit your Profile and click the +1 tab.
To delete items that you've +1'd, click the x to the right of the +1 summary. If you've shared the content that you +1'd, deleting your +1 from the +1 tab will remove your +1 from the content, but won't delete your shared post on Google+.
+1s and shared endorsements
The Shared Endorsements setting controls whether your friends see your name and face next to the +1 button in ads when they're looking at a product or brand that you've +1'd. You can learn more about shared endorsements here.