MSN had big flashing ads. When I first saw that I assumed I was dealing with another windows install with malware on it. I've paid for the OS, why have I got this freemium crap?
Slack has no way of letting me know who's read the messages. Come on, it's 2016. I asked them about this and they told me the only solution is it get each contact to add a sunglasses icon as they read each message! What a joke.
What does 'read' in a Slack context mean, though? If you scroll past it quickly, is it read? If you accidentally open your Slack window, is it read? A 'read' notification would just be a misleading user experience.
Read in the way a Facebook messenger message or a hangout message is read; you've got the "channel" open and the message is visible or is above the visible one. Clearly it's impossible to know whether a message has actually been read by a human but there Facebook/hangouts solution is almost perfect.
It's not visibility, it's focus (at least on desktop). If you don't click a messenger box, it will display the message but not acknowledge it as read (on the desktop client, on mobile it works based on whether the message is displayed while the app is open).
