On January 31, North Delhi Deputy Commissioner of Police Madhur Verma tweeted this photo of 80-year-old Alzheimer's patient Kamla Gupta, who was lost and unable to remember any of her contact details.
Hundreds of people retweeted the DCP's tweet over the next hour, before it was seen by user Vishal Jain who was in touch with Gupta's family.
After being put in touch with the concerned authorities, Jain informed the DCP that they were on their way.
And within two hours of the original tweet, Kamla Gupta was reunited with her family.