Google has just released a new feature called Google +1. This new feature gives users the ability to +1(Like) or add a tally to search results, which in turn will help add a socially shared relevancy measurement for search results. Developers will also have the ability to add the +1 buttons to website pages which in turn will feed your pages overall tally. Currently users will only be able to see the +1 tally’s from their contacts within their Gmail (or Google Talk) chat list, “My Contacts” group in Google Contacts and People they’re following in Google Reader and Google Buzz.
Google has hinted that they will monitor participation with +1, which in turn could affect its involvement in future search algorithm changes(Think Hotpot for organic). This feature is being rolled out as I write this, so you will have to opt-in through Google Labs/Experiments if you currently aren’t seeing it.