Telegram's "People Nearby" feature can find the exact location of those whose feature is enabled. Bounty hunter and researcher Ahmed Hassan detected the rarity and reported it to the messaging app's security. Hassan had noticed a similar problem with the Line app a few years ago and took it up with Telegram. However, when reporting it, Telegram said that this was not a problem and that there was no bug bounty. Hassan's concern is that this feature essentially allows anyone to find his exact location, which is incredibly dangerous. This is especially true of Telegram which, while a normal messaging app on its own, is preferred by extremist groups and hackers.