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The Nike ads, promoting the brand's ties with football, golf and basketball, were the second, third and fifth most-shared respectively, amounting to a combined share total of 199,138.

The most-shared ad this week, however, comes from Samsung, in an ad produced by the Viral Factory.

Viewed 1.9 million times since its launch, the ad contains spoof, amateur footage of a wild bear removing its coat of fur and putting it into a Samsung washing machine before putting on another, white, coat and becoming a polar bear.

The ad has generated 535 comments and 122 blog posts across the social web.In fourth position, Microsoft attempts to reconnect with "generation Y" in their "child of the 90s" ad created in-house.

The ad takes a nostalgic look back at a time before Facebook and features icons of the 1990s, including supersoaker waterguns, troll dolls and floppy disks, and has been shared more than 43,000 times in the last seven days.

Last week's number one, Fiat "motherhood" by Krow, drops off the ±±¾©Èü³µpk10 Viral Chart altogether.

To view the most-shared viral ads from previous weeks, visit the .

The chart, , ranks ads according to the number of times they have been shared on Facebook, Twitter and the blogosphere.

Ads launched more than 30 days ago are not included.

All time: 56,802 shares