But there are red/green dots in the chat pop-up on facebook. I believe mobility and the smartphone made it asynchronous because every knew you could be answeri

But there are red/green dots in the chat pop-up on facebook. I believe mobility and the smartphone made it asynchronous because every knew you could be answering on your phone but not be with your phone in your hand all the time whereas old school messaging app expected you to be sat down in front of a computer and it usually meant you'd be available for some time. Concerning invisibility I always thought it was a cool factor: "I am not here, don't need to be" combined with "I am not wasting time on messenger" and a lurking/stalking thing.