I've read on here a few sw use snapchat for work purposes, snapchat has made changes to the app where you can now see what and where other 'friends' are. This means you can literally see what street someone is on or if they're sleeping,in a car. You can change this by going to settings and changing to ghost mode. Apologies if this is old news but I just found out how intrusive the update actually is and wouldn't want strangers especially punters knowing exactly where I was!