Google +1 button is simply recommendation or like button. It is similar to Facebook Like button. You can share your recommendation with the world in google search result. You just need to click +1 button on a webpage you find useful.
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You can add +1 to your webpages, blog etc to help your site stand out. +1 buttons let people who love your content recommend it on Google search.
If you are searching some things in google and find exactly you want, you can recommend that search result with the help of +1 button.
In other words, sometimes it’s easier to find exactly what you are looking for when someone you know already found it. Get recommendations for the things that interest you, right when you want them, in your search results.
You first need a public Google profile. This helps people see who recommended that particular stuff. When you create a profile, it’s visible to anyone and connections with your email address can easily find it.
Your +1’s are stored in a new tab on your Google profile. You can show your +1’s tab to the world, or keep it private and just use it to personally manage the ever-expanding record of things you love around the web.
The +1 button is shorthand for “this is pretty cool” or “you should check this out.”
Click +1 to publicly give something your stamp of approval. Your +1’s can help friends, contacts, and others on the web find the best stuff when they search.
Currently available for English searches on Google.com.