Telegram has released version 5.80 of its iOS and Android app that adds several useful new features. You can now add people who are near you using the People Nearby feature. Both parties need to go into this mode and they will become visible to one another. Then you can then just tap on their name to exchange contact info. You can now also add people to your contacts when they message you even if you don't know their number. Next, Telegram lets you make location-based groups, which is a local group that works in a small area for neighbors, co-workers or...