As we demonstrated recently, the importance of video marketing is growing fast – with purchase statistics like these brands overlooking the medium are missing out big time.

Unruly Media has compiled its 2012 Social Video Share Index to highlight just who’s doing video the right way, and Google – up six places from last year – tops the leader board, knocking last year’s winner, Volkswagen, to the very bottom of the list.

According to Unruly’s report, Google’s videos were shared nearly six million times, over twice as much as VW’s, which were shared 2.25 million times.

Unruly co-founder Sarah Wood said: “Savvy brands are no longer creating content to merely watch their YouTube view counter tick up, they’re measuring who’s sharing the content, what they’re saying, and how it’s impacting brand metrics.”

But brands doing this need to keep their foot on the gas, as VW’s performance shows.