A pinned message is a post fixed to the top of a channel so every subscriber sees it first, regardless of when it was published. Channels use pins for announcements, rules, or a current promotion. Pinning is one of the channel-management actions an administrator bot like Autogram's can perform when you grant it the relevant permission.
A pin is channel state layered on top of the post, not a change to the post itself: the message stays where it was published in the timeline and is additionally surfaced at the top. A channel can hold several pins at once, presented as a stack subscribers can page through. Unpinning targets one specific message, while a separate action clears every pin at once.
By default the act of pinning notifies subscribers, which makes a pin two decisions rather than one: what deserves the top slot, and whether to interrupt everyone to say so. The alert can be suppressed. Automation that re-pins the same announcement on a cycle is the usual way this goes wrong, since each pin is a fresh interruption even when the content is months old.
The top slot is the first thing a new subscriber reads, which makes an expired promotion or a two-year-old rules post actively costly. The habit worth building is deciding when a pin comes down at the moment it goes up, and rotating pins alongside campaigns rather than leaving one permanent fixture. An unpin scheduled in advance beats one remembered later.
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