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Coca Cola's ad, capturing moments of kindness, affection and heroisism, was shared 240,000 times this week.

South American agency Landia created the film for the regional division of the global soft drink giant, showcasing footage of emotional reunions and daring rescue attempts.

The ad generated 344 blog posts, more than 4,000 comments and has been viewed more than 4.8 million times.

The Apple video, which was tenth in last week's chart, secured only 3,959 shares just one week after Apple's World Wide Developer Conference in San Franciso last week.

The reception was warmer for Microsoft's Surface tablet, which has been shared 216,805 times this week and has been mentioned in 533 blog posts since launching on Monday (18 June).

The ad, in second position, was created in-house and has been viewed more than 9 times a second since it was published.

As the US presidential race draws closer, Republican hopeful, Mitt Romney, has once again entered the viral chart with a political ad attacking Obama's record on the economy.

The ad, shared 23,960 times in the last week, follows a previous entry in which Romney laid out his plans to 'fix' America and repeal Obamacare starting from 'day one' in the president's chair.

Samsung, Ubisoft's Assassin's Creed III and Pine-sol have remained in the chart this week, while a new entry from the American Society for the Prevention of Cruelty to Animals (ASPCA) debuts in tenth position.

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.

Due to technical issues with Twitter's API, shares from the social network were not included in the count.

All time: 839,750 shares