Moms have long been a coveted audience for brands, but the ways to reach them are changing rapidly. In the past year, companies have shown an increasing propensity to move key communications with moms to the online and social media space. Brand ambassadors done in more authentic ways, such as McDonald's Moms' Quality Correspondents; tie-ins with events like BlogHer; and outreach to mom bloggers have become pillars of the new landscape.

Campbell's Soup Company held a “landmark” event on January 29 with ...