Wakubwa Tu 18 Fundi Simu Avujisha Picha Za Uchi -

The article title is likely stating that these 18 young people used TikTok videos (maybe images or videos) to expose some kind of issue or corruption (uchini). The phrase "simu" might be key here. In Swahili, "simu" means mobile phone, so maybe they used their phones (simu) to post these TikTok videos. Alternatively, "simu" could be a slang term or slang for something else like a tool or method.