A Pakistani sanitary pad ad which has used WikiLeaks to convey its advertising message in Karachi has gone viral on the internet.

Butterfly's tongue-in-cheek slogan "WikiLeaks... Butterfly doesn't" seems to have caught everybody's imagination.

A photograph of the billboard has been pasted numerous times across social networking sites such as Facebook, Twitter, YouTube and on blogs.

Karachi-based RG Blue Communications, which created the billboard campaign, told the Express Tribune that a print campaign was also on the way.

The whistleblower site created a sensation in the country after it revealed secret documents about a military plot to assassinate President Asif Ali Zardari and the government's secret approval of US drone strikes on select targets.

Amjad Hussain, head of business development at RG Blue Communications, said the response to the billboard campaign had been great. "Nobody has said it's in bad taste yet," he added.