Instagram queens spread influence at Cannes Film Festival They have hundreds of thousands of followers on social media, and they make a living promoting brands in the pictures they post. But now Instagram's celebrities are flocking to the Cannes Film Festival to join forces with agencies like Hemblem, which specialise in product placements with 'influencers'. Hemblem has invited these stars to this year's festival, in exchange for posts raising awareness of the 1smileatatime charity, helping provide Syrian refugees with a winter coat that can turn into a sleeping bag. IMAGES AND SOUNDBITES