Several prominent media companies are joining Google as launch partners for the Web-based +1 button, including Bloomberg, The Huffington Post, and Reuters.
Readers on those sites will be given the option to click the button on content they like, which will highlight that content in search results when friends or social-media connections search for similar topics.
Google has been testing the feature within search results since March, but the broader launch might increase usage similar to the way buttons from Twitter and Facebook encourage sharing of Web content among connections in those networks.
Any Web publisher can add the buttons to their site. Google provided detailed instructions here.
The “+1” button is intended to help Google mirror social network style information-sharing without the benefit of a social network of its own.