On Valentine's Day, Joy Kalekye says she received a call from a friend who sounded really worried. She told her to check social media because someone had posted a video of her. The clip shows Kalekye, then a 19-year-old student, standing on her own by the side of a busy road in the Kenyan capital, Nairobi, looking down at her phone. Whoever is filming walks towards her, and says: "Hi, I like how you look." It was an encounter Kalekye had forgotten all about. "I realised, oh, it's this Russian