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RockingPage is a free tool that finds the most trending websites all over the internet based on popularity (Alexa Rank), social reach (Facebook Shares) and Authority (referring domains).
Select from 3 segments: Big players, Rising stars, Newcomers and from 3 timeframes: daily, weekly, monthly.
Subscribe to get pages that rock to your inbox.
All in all a good tool to find out which is the most trending website with detail about the alexa rank and fb shares.
As with all new products, iterations will develop with constructive comments from users and thoughtful consideration by creators.
Never though some of the websites I found are that popular right now :)