Who Is Growing Faster Than Skype?

We spotted this today:

"Well, by at least one measure (registered users 9 months after launch), mobile video chat service Tango is outpacing Skype. Tango now has 17 million registered users across both Apple and Android devices, only 9 months after it launched. By comparison, Skype celebrated 9 million users on its first birthday back in 2004."

Statistics Source: TC