> For example, Zuck says he runs the company via Messenger - but a chat tool without selective muting/@mentions (or equivalent) is bound to be messy at the scal

> For example, Zuck says he runs the company via Messenger - but a chat tool without selective muting/@mentions (or equivalent) is bound to be messy at the scale at which he's working. He does; he’s a bit of an outlier in how he can handle intense communications, but Messenger at his scale is not less manageable than e-mail — it mainly encourages extreme brevity. The information filtering is done using groups and notification that allow everyone to target their attention; his is focused on high-level groups that distill details from other working groups.