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The ad, "thank you, mom", adds to a string of successful viral ads the brand launched leading up to the London 2012 Olympic Games. Shared 230,667 times this week, the ad was created by Wieden & Kennedy.

Another viral chart regular, Old Spice, has entered the listings in third place with its latest "mom song" ad, giving Wieden & Kennedy its second spot in the chart this week.

The ad, which shows mothers lamenting their sons growing older in a bizarre song, was created by Wieden & Kennedy Portland and has been shared 97,989 times in the past seven days.

Continuing the bizarre theme, an ad for Doritos has entered the chart in eighth place with 18,919 shares this week.

Created by Photoplay Films, the ad shows a man putting his finger, covered in Doritos seasoning after eating from a bag of the tortilla chips, into a "finger cleaner", powered by a man sitting in an office who sucks fingers as they are entered.

Cristiano Ronaldo also returns to the chart, this time in an ad for Samsung. The ad features the Portuguese football star competing against a women's volleyball team, before leaving the court and speaking into a Samsung Galaxy Gear smartwatch.

The chart, ranks ads on YouTube by the number of shares across Facebook, Twitter and the blogosphere. Ads older than 30 days are not included.

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