excerpt from scratch team: How does the Network Connectivity block work? This block only runs on your own device, and is not storing any data about you. When a user plays a project with the Network Connectivity block, it runs a check back to your browser to see whether the browser believes your device is currently connected to the internet. The information it returns is a simple “yes” or “no.” Why did you release this block? Some Scratchers adapt existing blocks/extensions to check whether or not users are online. This block provides a built-in solution to Scratchers who want to include this function in their projects. Can I use the Network Connectivity block to see if (my friend/my favorite Scratcher/the Scratch Team) is online? No – this block can’t return information about any other Scratchers. Network Connectivity blocks are connecting back to your browser only as you run a project that uses them. The information about whether or not you’re online is only visible to you.
