Blogs have turned out to be the ultimate killer online App--haven't they? Maybe not. A Silicon Valley company, Jaxtr, is rolling out a new service that will supercharge blog sites everywhere with an old-world solution: telephony.

SAN FRANCISCO (Reuters) - A Silicon Valley start-up is gearing up to embed free, Web-based telephone services on a variety of popular social networking and blogging services, including MySpace, Friendster and Blogger.

By contrast with existing Web calling services such as Skype that are typically computer-based, or require consumers to buy special headsets or microphones, Jaxtr plans to allows users to make inbound calls to bloggers from any phone in the world.

Jaxtr, a 14-month-old closely held company based in Palo Alto California, said it is beginning a test by private invitation of its new calling service, with plans to make it widely available to Web users sometime early in the new year.