How Tumblr Incorporates Advertising Without Users Noticing

From Business Insider:

Incorporating advertising on photo-sharing or visually-driven sites has yet to be done successfully, mostly because companies haven’t been able to do it without completely disrupting the user experience.

But Tumblr, whose CEO David Karp really doesn’t like advertising, is working on a way to crack the code.

We asked Rick Webb, consultant on marketing and revenue at Tumblr, how Tumblr is using advertising and if it is actually working, at our IGNITION conference last week.