Google starting from today rolling out a new feature of the +1 button in platform preview, in which when users hover over a +1 button, they will see recommendations for other great content on your site. To keep these recommendations more relevant and on-topic, they will always refer to pages on the same domain or subdomain as the +1 button. But if you do have +1 button already on your site, you need not to do anything extra. Recommendations will work across all +1 buttons for all users, whether or not they’re signed into Google+. This update will go live to all of your users in the next few weeks.
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