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Since the days of Google Buzz, the +1 button has been a mystery to users and content producers alike. It’s different from Facebook’s“Like” button, in that it doesn’t directly share content to a user’s social stream. But the cultivation of a social graph has long been the goal of Google, and its connection to search was likely inevitable.
Google defines the +1 as a feature to help people discover and share relevant content from the people they already know and trust. Users can +1 different types of content, including Google search results, websites, and advertisements. Once users +1 a piece of content, it can be seen on the +1 tab in their Google+ profile, in Google search results, and on websites with a +1 button.
The plot thickened last month when Google launched Search plus Your World. Jack Menzel, director of product management for Google Search, explained that now Google+ users would be able to “search across information that is private and only shared to you, not just the public web.” According to Ian Lurie from the blog Conversation Marketing, in Search plus Your World, search results that received a lot of +1s tend to show up higher in results.
Google has come out and described the purpose of a +1, but hasn’t necessarily explained the direct effect a +1 has on search ranking. Here’s a breakdown of what we currently know.
The +1 has an indirect effect on your site’s search rank. This does not mean the more +1’s a link has, the higher rank it achieves in traditional search results. Take this scenario:
When a Google+ user +1’s a piece of content, he gives it his “stamp of approval.” Then, say one of his connections from Google+ searches for the same or related topic. Because of Search plus Your World, his friend is more likely to click on the same link the original user +1’d (when a signed-in user searches, his Google results may include snippets annotated with the names of connections who have +1′d the content). This is because content recommended by friends and acquaintances is often more relevant than content from strangers, according to Google.
This is also true for users who are not signed in to their Google account when they search. When a user searches for the same phrase, the results might display the total number of +1’s a link has received, which is another validation that it’s a relevant link.