I’m not answering calls from trolls!

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.

Once registered on Jaxtr’s site at , a user can embed an interactive phone feature into selected blogs or social network profiles — News Corp.’s MySpace, Tagged, Friendster, Hi5, Xanga and Google’s Blogger.

Consumers will be able to click on any Jaxtr link, enter their own phone number, which triggers an instant call to their phone. Answering the phone connects the caller to the Jaxtr user’s own phone. Callers then speak phone to phone.

A recipient gets to choose which of their phones receive the call. One can switch between a home, office or mobile phone, for example.

Who will use this the most? Horny teenagers, trolls or hookers?