TikTok, the social media app for 15-second videos
The latest social media app on the scene is TikTok, with over a billion downloads. TikTok features user-generated videos no longer than 15 seconds: the most popular videos show teenagers lip-synching and dancing in heavily-edited videos. Videos find popularity with challenges, where users all put their own spin on the same type of video. Plus, learn the English phrasal verb "serve up."