Supernova: Ex-Saatchi Sir John Hegarty backs social network Tech Sir John Hegarty, the creative heavyweight behind Saatchi & Saatchi, TBWA London and Bartle Bogle Hegarty, has become an investor and creative adviser to social network Supernova. The platform, created by former Saatchi adman and BAFTA winner Dominic O’Meara, bills itself as “social media for grown-ups”, promising to donate a share of every ‘like’ to [...]