Don't tell me you don't know about the Google +1 Button yet. It is Google's way of liking things like search results and Google+ wall posts, images, etc. But Google knows your likes are way out of the search results and Google+ things. That's why, they have made an extension using which you can like every webpage you access using the +1 button. The webpage then, appears on your Google Profile just like your other +1's so every one who accesses your Google Profile would know which sites you have visited and which sites you have liked.
When you install it, the Google +1 icon appears on the extension bar. Another amazing thing is that it also gives you the count of the total +1s on the webpage you are accessing. So, now you can +1 a web page, anywhere you go on the web. Remember, all of the pages and URLs you visit will be sent to Google in order to retrieve +1 information.

Shut Up Devil's Extension Review
Unique extension definitely. The Google +1 Button has really been a standout from the day it was first launched. Google made this +1 button available for blogs and websites. They added it to the fastest growing social networking site, Google+ which has really boosted the growth of this +1 button and this new addition would again boost the growth of the +1 button. There aren't much special things in this extension as you just have to click and +1 a site. Just that. But, to share the sites you like while not sharing it actually would be awesome. Just try it once and you may keep it forever.
Features : 4/5
Performance : 5/5
Overall : 4.5/5
Link : Google +1 Button Extension