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As men the world over attempt to grow facial hair in support of charity, star of American TV and cinema Nick Offerman gives valuable tips to speed the process - including studying with Tibetan monks, washing with whale oil and eating a raw onion.

The ad, created by Brake Media/Made Man, has been shared 38,997 times and ranks in eight place.

Topping the chart, an ad by 72andSunny for Activision's Call of Duty: Black Ops II, was shared 265,013 times.

Directed by Guy Ritchie, the ad stars actors Robert Downey Jr, Jack Black and Zach Galafianakis.

The launch trailer for the same game features in tenth place, shared 36,703 times and viewed 6.3 million times.

Elsewhere in the chart, two ads for Barack Obama's presidential campaign, and one for Mitt Romney's, appear in the most shared chart just days before the close of the election.

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: 131,683 shares