Behind TikTok's sweeping new controls on influencer marketing
Katie Feeney, an 18-year-old TikTok creator, sets up a smartphone on a tripod at Rio Park in Gaithersburg, Maryland, U.S., on Thursday, April 15, 2021 (Shuran Huang/Bloomberg)
WPP Media has issued a report attacking the quality of desktop and mobile inventory sold via Publicis Groupe's Epsilon SSP, a rarity even among industry rivals.