What makes ads worth spreading?

As much as Adwords is an incredible advertising delivery mechanism, it can only ever be as good as your advertising itself.

In this video Youtube and TED asks the creators of some of the most popular viral videos of last year the question:

“What makes ads worth spreading?”

[Film] Google Project Re:Brief

What would happen if you took the most iconic Advertising Creative Directors of the 60’s and 70’s and asked them to translate, re-interpret and adapt their best work for the internet today?