Jaxtr is a free service that brings voice to social networks and blogs. It focuses on consumers with online profiles. Users can link their phones with their online network to hear from callers worldwide while keeping their existing phone numbers private and giving them control with the people they meet online.

Jaxtr reported 5 million registered users in 5 months since July 07. This makes Jaxtr the fastest growing Internet communications service in history ahead of Skype, Hotmail and ICQ. Out of the huge user base 85% are international users and only 15% are North American.

What’s Jaxtr’s Viral Strategy: It’s an email signature calling links (send messages to all your address book contacts). Something like
I am using Jaxtr, and if you also sign up, we can talk for free on the phone at any time.
-Sender

P.S. Here is the link to sign up:
http://www.jaxtr.com/user/ticket?n=T10ftmmlt9×5oc&type=joininvite&eb=87

My Assessment:

• The large number of international users Vs US users shows that growth is driven by Free Call messaging which has a huge appeal outside US
• Jaxtr sends emails to all the contact listed in the address book

I am not convinced about the existence of demand for Jaxtr’s service and this can be seen by fewer uptakes on their Facebook app.