If this is on CB, it's probably viewers using the 'next cam' feature (it's in the top right corner of the screen, see below). Other sites may have a similar feature.
It can be fun sometimes if you'd rather just take a random approach, rather than scroll through pages of thumbnails or search hashtags.
Only takes an instant to decide if you're moving on or not.
If the constant announcements of users in/out is a distraction, or makes the chat scroll too quickly to follow, you can change settings to show certain user types only, or none at all.
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