The agency has already promoted the firm's Britain's Got Talent social media buzzer, which allows viewers to vote live on acts.
It has now been charged with raising Live Talkback's profile in other ways, beginning with the consumer launch of Tellybug, the company's new iPhone app, which helps British TV fans to chat about shows.
Live Talkback already provides social voting for ESPN's Man of the Match selections during live football matches and Sky News is using the Tellybug technology for live viewer polls.
Dynamo founder Peter Bowles said: 'We're working closely with Talkback Thames and the other producers of Britain's Got Talent to make sure we raise the profile of the app. We're also helping in the social media outreach for this to help boost the number of shared buzzes on Twitter.'
The move comes as research from Nielsen found more than 85 per cent of mobile and PC users access the web while watching TV.
Live Talkback head of business development Irwan Owen said: 'We're providing the technology to broadcasters and consumers to engage with viewers in social media conversations - whether it's Question Time on BBC or 10 O'clock Live on Channel 4.'