Facebook members may never have to visit their lingering MySpace pages again thanks to a new application from Fuser.

The email aggregator service late Thursday launched a Facebook application that allows users to view their MySpace messages, comments, and bulletins all from within their Facebook page.

The company’s mission is to “create tools to simplify users’ digital lifestyles,” Fuser Chief Technology Officer Jeff Herman said. This application “takes some of the goodness of Fuser’s mail product and applies it to Facebook.”

Founded and backed by Jared Polis, who co-founded bluemountainarts.com, Fuser’s core service is an ad-driven email aggregator that allows members to access all of their email and social network messages through one interface for free.

Although Mr. Herman sees MySpace and Facebook as two unique platforms, he believes that a lot of people who are on MySpace are on Facebook as well.

Hitwise numbers agree. About 20 percent of Facebook visitors navigated to MySpace after visiting Facebook, according to an October study from the researcher, up from 10 percent a year ago.

If users respond to Fuser's application, the company plans to unveil more functionality, including the ability to respond to and delete MySpace messages from within Facebook.

This application isn't exactly a MySpace killer. While Fuser was eager to take advantage of Facebook’s open platform, the startup also plans to move its application to other sites such as MySpace, allowing the reverse effect. Plus, MySpace and Facebook serve different demographics, Forrester Research analyst Jeremiah Owyang said.

MySpace’s media-driven site skews toward a younger demographic, Mr. Owyang said. While MySpace is more about self-expression and artist affiliation, Facebook is more of a networking tool. After launching with a college-aged user base, Facebook now has its largest growing demographic in the thirty-five and older range, he said.

Given that Facebook, Bebo, Friendster, and LinkedIn have already opened up their platforms to third-party developers, and other social networks promise to follow suit with Google’s OpenSocial, Mr. Owyang expects the fluidity between networks to only increase.

Forrester Research predicts that the social graph, the online representation of a person’s relationships, will become portable in 2008. For instance, if you are already on one social network, you will soon be able to autopopulate any new social network you join with your previously established contacts, explained Mr. Owyang.

The Fuser application for Facebook “is another example of how social networks are starting to be more amorphous,” he said.

Red Herring's April Kilcrease reported from Belmont.