There is a lot of that, and somehow it is acceptable online, while when you project it to face to face situations it would be really rude behavior. Like in a chat room when you ask someone something with an explicit mention of their handle, only to see the presence indicator pass it by without any response. Not even taking time to give a Yes, No, or Too busy now.
Or how in a private group someone who was invited suddenly leaves the group membership, hops off the channel. Comparative to walking out of a meeting without saying a word and provide a reason. A simple "I enjoyed it here, but I have to spend my time elsewhere" is just simply a polite thing to do, and costs only 2 seconds of time.
Social media has strong parasocial tendencies.