Do you have any idea about Alexa, Here is the answer. Alexa is the Amazon owned Web Analytics Company which provides a unique tool to maintain the website ranking based on the site performance. Alexa ranking is estimated by including the number of visitors to the page, quality links, page view, and
Alexa Ranks in SEO is one of the major metrics for blogger nowadays, but its not simple to improve the Alexa ranks of any website. but these options can help you a lot to improve Alexa ranks. Apart from companies and organizations, some people run different types of blogs as their websites
"Top 20 Most Popular Social Bookmarking Websites | January 2010
Here are the 20 Largest Social Bookmarking Websites ranked by a combination of Inbound Links, Alexa Rank, and U.S. traffic data from Compete and Quantcast."