The Hong Kong partnership follows the same arrangement between the two companies in Singapore, New Zealand and Australia, all signed earlier this year.
"This agreement will see us form advertising partnerships with other brands who have an affinity with Skype customers," Aaric Lo, Ad2One's commercial director for Hong Kong, said. "As the average Skype user is slightly older than the average internet user, is more educated and has a higher income, and travels frequently."
According to ComScore Worldwide, the total unique visitors of Skype increased 41.1 per cent over the year to April 2011. That compares with growth of 34.5 per cent for Facebook, and 17,8 per cent for MSN.
According to PC Magazine's article on Skype on 15 September, Skype has introduced an update for its beta Mac app that brings the Facebook integration already available on Windows PCs. Skype 5.4 for Mac Beta basically brings Facebook functionality into Skype.
Marriott Hotel Group has signed up as Skype's first advertiser since the new partnership.
Ad2One is also the display advertising sales rep for Linkedin, Reuters, covermagazine.hk, Businesstimes.com.hk and businessinsider.com.
Reported in July, Dentsu has signed a deal making it Skype Technologies' exclusive display advertising partner in Japan.