The green dot on Snapchat can remain visible for up to 24 hours after someone has been active, making it an unreliable indicator of their real-time online activity.

When a green dot appears in the top-right corner of your screen – right above your cellular bars – this means an app is using either the camera or the camera with the microphone on your phone.

The green dot indicates someone has been active recently, but it isn't super precise. Thankfully, there are a few ways you can try to determine if someone is currently online on Snapchat. One of ...