New York—TechMediaNetwork Inc., parent of such online media brands as Laptop, Space and TopTenReviews, announced three executive appointments. Doug Llewellyn, former VP-corporate and business development and national digital ad sales at Manta Media, was named COO. Llewellyn previously spent 11 years in senior management positions at CNET Networks and CBS Interactive, which acquired CNET in 2008. Mike Kisseberth, former president-CEO of IDG's Consumer & SMB unit, was appointed chief revenue officer. John Potter, TechMediaNetwork's new chief technology officer, was formerly VP-software engineering at CBS Interactive. The appointments were announced by Greg Mason, who became CEO of TechMediaNetwork in December.