Chicago-based Sibson & Co., which provides sales and marketing consultation services to big companies, said Friday that it has launched a b-to-b advertising campaign aimed at CEOs, COOs and CFOs. Sibson launched the first of its advertisements in The Wall Street Journal. Taglined ``are you dangling carrots in front of carnivores?,'' the campaign is designed to promote Sibson's Internet employee acquisition, payment and incentive platform, dubbed e-pay. Sibson is backing the print campaign with a direct mail component, directed at thousands of executives internationally. The agency of record and budget for the campaign were not disclosed.