Isagenix International is asking Facebook users to select the “fan favorite” in its annual IsaBody Challenge. And the company is using Bulbstorm’s Idea Challenges application for Facebook promotions to do it.

Ranked among the fastest-growing companies by Inc. magazine for the last three years, Isagenix is a leading consumer products and services company that develops and manufactures systems to assist in weight management, long-term wellness and skincare.

With its challenge, Isagenix asks fans to vote and comment on finalists in the 2010 IsaBody Challenge. The “fan favorite” will receive recognition on stage at Isagenix’s annual Celebration event.

This challenge is a great example of how integrating Facebook with existing online and offline promotions can enhance user engagement and experience with a brand.

Isagenix has already made headway in the social stratosphere with an 18,000-strong Facebook fan base and more than 2,000 Twitter followers.

The company even hosts a Social Media Roadshow designed to help participants “harness the power of Facebook and Twitter.” Adding Idea Challenges to its toolkit will help Isagenix continue to build a network of engaged, loyal fans.

Kevin Gawthrope, senior manager of web services for Isagenix, is enthusiastic about the campaign’s potential.

“Our team is very excited about the potential of working with Bulbstorm,” Gawthrope said. “We’re always on the lookout for innovative methods of engaging with members of the Isagenix community online. The Idea Challenges application is a great addition to our social media presence.”

Check out Bulbstorm’s new promotion with Isagenix on the Isagenix fan page on Facebook.