I watched a documentary on Netflix about Tania Head, internet troll extraordinaire. She joined 9/11 survivors support groups, got to know them and then became one of them. She even became the president of their survivors organization! She made up an elaborate story about being married to a man who died in the Twin Towers and how she had been badly burned after the second plane hit. She claimed to have been rescued by the man in the red bandana and even met with his family to thank them. The truth was that she was living in Spain during 9/11 and she had never even been to NY until she decided to become her internet persona. The whole story is so bizarre and creepy!
Here's a youtube vid about it ... the Netflix/Hulu documentary is called "The Woman Who Wasn't There".