Among Facebook audiences worldwide, engagement with brands, via likes, comments, and shares, is surging in 2012, according to report by Adobe.

The findings are based on Adobe's Digital Index, which covers some 260 billion ad impressions across 338 companies as well as Facebook activity among roughly 70 million fans.

As of the third quarter of 2012, engagement levels with Facebook brand posts jumped 896% over those recorded a year earlier (index base of 100%). The figures below show quarterly index changes over the 3Q11 baseline for brand post engagement:

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