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This is a list of the most popular websites worldwide according to the first 50 websites listed in the global "Top Sites" lists published by Alexa Internet, as of January 31, 2018, and SimilarWeb, as of December 2017, along with its rating on the corresponding service.
Ranking measures
Alexa ranks websites based on a combined measure of page views and unique site users, and creates a list of most popular websites based on this ranking time-averaged over three-month periods. Only the site's highest-level domain is recorded, aggregating any subdomains.
SimilarWeb ranks websites based on a panel of millions of Internet users, International/U.S. internet service providers, direct measurement of web traffic from data from thousands of websites and web crawlers scanning public websites