Speaking at the Media Guardian Changing Advertising Summit, Worrell said marketers and agencies should not get "obsessed with clicks" because online advertising would have a value regardless of whether people click on it or interact directly with it.
Worrell said just because immediate responses to digital advertising could be measured, it did not mean they were its only value.
He said: "Don't get obsessed with clicks, you need to take wider view."
Presenting a session entitled "Future outlook: TV content online", Worrell, who is Specific Media Europe's head of consumer insight, said the TV industry could learn from how the outdoor sector has evolved to stay relevant in the new digital media environment.
Worrell said: "Outdoor utilised consumer and properties and digital. Businesses like Specific Media and many others in the digital space have evolved into serving video.
"We've purchased content, MySpace, we now have a studio and we serve across all devices. Brands must evolve too."
Online video would bring in bigger advertisers to digital, he said.
"Digital has long been the favoured medium of choice for people operating at the bottom of the funnel but video opens up opportunities for brands at the top of the funnel."
Worrell said research showed nearly all people surveyed were watching online TV, 55% of people were watching more than one hour of online a video a week, and the majority was watched during evening peak time.
He added: "The type of content is professional mainstream TV content. This is the content that's driving growth in online video."
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