Skype announced that it now had more than 100 million registered users worldwide, an Associated Press report said.
Luxembourg-based Skype had 54 million members when it was bought last September for $2.6 billion by online auctioneer eBay.
The report said Skype gave away software that allowed people to talk for free from computer to computer, or pay a small fee to place and receive calls from regular phones.
While the number of people who used Skype regularly might be far less than the number of registered users, the Skype application reported that 5.9 million people were logged in, the report said.