Accountability Gaps in the Fake Follower Market. - Maksim Kalameyets; Rebecca Owens; Hicham Hammouchi; Anastasia Sergeeva; Sviatlana Hoehn; Eldar Jalilzade; Jindi Wang; Suchitha Patel; Stergios Aidinlis; Ben Farrand; Gabriele Lenzini; Lei Shi 003 (FAccT, 2026)