They are advertising The Swarm on the side of youtube videos now, I would say that good advertisement, cos according to youtube:
Over 800 million unique users visit YouTube each month
Over 4 billion hours of video are watched each month on YouTube
In 2011, YouTube had more than 1 trillion views or around 140 views for every person on Earth
Millions of subscriptions happen each day.
so a not every country will see the advert, but a lodda lodda people are still gonna see it.
I did do a print screen of the advert, I dont know how to get it on here though.