#6 Amazon

About 1 percent of online time is spent on this online retail giant. Amazon.com has 128 million desktop users and 80.5 million mobile visitors.

During the most recent holiday season, sales conducted by a third-party on the web site were up 40 percent from the same time in 2011.

Amozon also added streaming service for movies and TV programs to its portfolio in recent months.

Amazon has made significant inroads in mobile usage, with more than 80 million people accessed its  site through a mobile device in December 2012, higher than all Web properties except for Google, Facebook and Yahoo!

#5 AOL

AOL (AOL) has transformed itself from a company that was primarily providing dial-up Internet service into a media company. Its online tributaries attracted about 2.5 percent of time online, accounting to 117.6 million desktop visitors and 62.4 million mobile visitors.

 The company's most popular news web site is The Huffington Post, which it bought in 2011. The Huffington Post, like many news outlets, recently has devoted many of its resources to video programming. The company launched its news streaming service, HuffPost Live, in August 2012. The service was created with the intent to engage users. Features, such as the "join this segment," let viewers speak their mind via webcam.

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