• Often overlooked, “how to notify others of their actions” is very important in software used by multiple people.
  • When Facebook included a notification digest feature (reducing notifications on its own), people who used the feature thinking they could get through to others without explicit mentions fell into miscommunication.
  • When Slack introduced the threading feature, people who didn’t realize that posts in the tree were not notified to some people got hooked. - Misunderstanding Slack’s threading feature and notification coverage
  • In Microsoft Teams, when you add someone else to a new channel and write there, the other person may not notice it because the channel is collapsed.
  • Email is a very successful decentralized notification system, but because it is decentralized, each user’s availability is uneven.
    • Cases where file attachments are rejected because they are over capacity
    • Software to send HTML emails v.s. Software to hide HTML emails
    • The question of whether or not to erase quotes from past emails.
    • Don’t cut the thread.” v.s. “What is a thread?”

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