Who Are The Most (and Least) Engaged Brands on Twitter?

Having the most followers doesn't necessarily add up to an engaged audience.

Engagement is an increasingly important metric for determining the value of social marketing. Pageviews, user signups, and other vague metrics don’t provide enough insight into how a brand, service, or network is doing. SocialRank has compiled a list, the Global Brands Index, ranking brands on Twitter by their level of engagement.