Winning YouTube is part art, science, web savvy, luck, and let's be honest: deep pockets to buy advertising. Some agencies, like OMD and Wieden & Kennedy, make it look easy.The media agency and creative shop headline YouTube's list of the top agencies to have run ads on the Google-owned video service last year (full list below).YouTube's agency rankings are determined by how many times an agency's video ads -- only videos that have run as ads on YouTube are counted -- made YouTube's monthly ads leaderboard in 2013. That leaderboard evaluates the ads according to how many paid and non-paid views they received as well as how much of a video people watched.
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