In 2012, when One Direction fans saved a fellow Directioner who had become suicidal. When the troubled teen tweeted she’d taken some pills because the band wouldn’t follow her, the rest of the Directioner fandom encouraged her to call for help.
When that didn’t work they got the hashtag #PrayforTaylor trending in order to get the attention of police. And it worked. She was taken to hospital and her life was saved.