Internet telephony service Skype has reached record levels with 29,527,474 people logged in at the same time on 21 February 2011.
The new high is up 4.3% from the previous high mark set last month, according to the Skype Journal blog.
Skype saw growth in the number of international calling minutes made in 2010 which was double that of every other phone company in the world, according to US reports.
In January, data from market analyst TeleGeography showed growth in international call traffic had slumped, while international traffic routed via Skype continued to accelerate.
Despite Skype's rapid growth, Skype Journal estimates the number of active Skype users around the world as around 177m. Facebook membership is three times that figure.
It also remains to be seen whether Skype can maintain its rapid growth in 2011 in the face of increasing competition from other voice-over-IP service providers such as Google Voice, Jajah and Rebtel.