Google has launched a sharing button of its own, competing for space with Facebook's "Like" button and the Twitter "Tweet" button. Google +1 takes advantage of the search engine's huge user base, flagging up the recommendations of your friends and contacts directly on the search results page; as long as you're signed in, you'll see positive feedback on the results your friends approve of.
Video demo after the cut
Initially +1 buttons will only be found in among Google search results, but eventually the company plans to offer the same functionality to third-party sites to include. That will allow readers to flag up good content directly in the search results, rather than requiring them to go to Facebook or Twitter to see recommendations.