Updated Feb 15, 2021 | 16:32 IST On Monday, a new trend emerged on Twitter that saw netizens sharing details of what they did at the age of 21. 'At 21' trends on Twitter after arrest of 21-yr-old activist  |  Photo Credit: Twitter Disha Ravi, a climate activist from India, was arrested in the Greta Thunberg Toolkit controversy by Delhi Police's Special Cell on Saturday. The 21-year-old was arrested, with charges that she was a key conspirator in the formulation and dissemination of the 'toolkit'. The Delhi police alleged that Ravi started a WhatsApp group that collaborated to draft the document. "Disha Ravi is an editor of the Toolkit Google Doc and a key conspirator in document's formulation and dissemination. She started a WhatsApp group and collaborated to make the Toolkit doc. She worked closely with them to draft the Doc," tweeted the Delhi Police.