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Samsung and its agency Cheil dominate the chart this week with three ads, shared a combined 375,000 times.
The Government has relaxed its partnership guidelines, making it much easier for brands such as Asda and Coca-Cola to partner with government ad campaigns such as Change4Life and Think!
Audi supports the launch of the new 'Star Trek' film with a viral that pitches actor Zachary Quinto against original Spock actor Leonard Nimoy.
Beyonce's ad for Pepsi slips out of this week's chart but the megastar makes a reappearance in a spot for H&M, alongside work for the Windows Phone and the Nokia Lumia 920.
Evian's latest baby ad has shot to first place in the chart after being shared 1.5 million times this week.
A comic ad from American retailer Kmart has shot to first place in this week's viral chart after being shared more than 1.2 million times in the past seven days.
Pepsi's spot starring music megastar Beyonce is the most-shared ad this week after generating 226,737 shares across Facebook, Twitter and the blogosphere.
Google's video ads for its range of products dominate this week's viral chart, after five of the internet giant's April Fools ads racked up a combined 739,189 shares across the social web.
Twitter's ad, celebrating its seventh birthday, has been shared more than 28,000 times this week, but Pepsi Max's hidden-camera viral, starring Nascar's Jeff Gordon, remains in first place.
A Brazilian ad for Dove's Men+Care range of shampoo, created by Ogilvy & Mather Brazil, has been shared 232,831 times to become the third most-shared ad of the week.
