Beyond “good luck”, teammates want to show concrete impact, build a shared keepsake, and avoid generic lines that feel hollow.
Very short Slack chains, risky jokes, or forgetting remote teammates. One guestbook link reduces those biases.
You keep a living, multimedia, exportable memory without forcing everyone into the same live slot.
Yes: prefer facts, gratitude, and concrete wishes over empty superlatives.
Often 5–10 business days are enough; nudge once mid-flight.
Yes, the board owner can remove an inappropriate message.
Yes, creation and collection are free.