Which events reach you, and where they reach you.
Notification settings decide which events produce a notification and which of those also send you an email. Everything still lands in Activity either way — the setting controls what interrupts you, not what is recorded.
The activity feed
One stream of everything that happened, newest first.
Referring somebody
You get a link. Here is exactly what it earns, and what the credits get you.
Using messages
Where a conversation lives, and how to keep track of which role it is about.
Your account and where you are signed in
Changing your details, your password, and ending a session you do not recognise.
