Which Dragon's Den investor was a co-founder of the advertising company Social Chain?

Steven Bartlett was a co-founder of the advertising and social-media company Social Chain.

Bartlett co-founded Social Chain with Dominic McGregor in 2014. The company developed campaigns and brand strategies built around online communities and social-media culture, helping establish Bartlett as a prominent figure in digital entrepreneurship before he joined Dragon's Den.

His business background differs from that of Dragons whose careers were built mainly in retail, property, manufacturing or leisure. That distinction is useful when identifying him: Bartlett is most strongly linked with Social Chain, The Diary of a CEO and digital media.

Social Chain later became part of Social Chain AG, and Bartlett subsequently moved away from day-to-day leadership of the business. These later corporate developments should not be confused with the founding fact. On Dragon's Den, his technology and online-brand perspective became part of the panel's range of expertise.