After testing Google officially launched its new and own recommendation system +1 Button. The +1 Button will become integrated into various Google own products including the search engine. The system, which now is available to become integrated into websites as well, is a common indicator of the popularity of content and may show favorites and recommendation of friends, if logged in to a Google account. Below is the official blog post about the launch of the system and the homepage of +1 Button with instructions to integrate the system into websites.
The +1 button for websites: recommend content across the web
FOLDEN.INFO Directory Sources: Recommendation System, Social Media Marketing – News Rating – Product Recommendations, Social Shopping