Google +1 Challenges the Cross-Web Presence of Facebook's Like Button

Google today launched a new feature called “+1” that allows Google Profile users to endorse search results, ads, and soon web pages. +1 could be the social layer Google has said it was developing for its product line, or at least part of it. Currently, +1 will help Google contest Bing’s Facebook-powered social search, and bring social context into its AdWords ads product, which has encountered new competition from Facebook’s interest, demographic, and friend connection-targeted performance ads.