The Brands Redefining Social Media in 2011 list recognizes the brands that are leading and shaping social media. Here are a couple examples:

American Express, WOMMA Governing Member: From their “Link, Like, Love” program with Facebook, to OPEN Forum with LinkedIn and location-based programs with Foursquare, American Express engages users in a wide variety of ways.

Coca-Cola, WOMMA Member: Aside from a robust presence on Facebook and Twitter, Coca-Cola has some creative initiatives to tie the brand with “happiness,” including a team of “Happiness Ambassadors” and “Happiness Machine” intended to create viral videos.

Read what else the top social media brands are doing at iMedia Connection.

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Want to learn from these leading brands first-hand? Hear from American Express and Coca-Cole at WOMMA’s Talkable Brands Exchange in NYC on Oct. 11, and WOMMA Summit in Las Vegas, Nov.16-18.