Driving 51% Engagement through Social, Mobile, & Email can be summarized as follows: 1. The document discusses how businesses can use social media, mobile, and email channels to engage 51% of their customers and drive engagement. 2. It provides tips on how to measure engagement across these channels, including through metrics like fans, interactions, leads, conversions, and loyalty. 3. The document also offers advice on how to set goals for these channels and considers seven practical considerations for implementing a social media strategy.