Think of #sli as a filter on the wider porn caption caption archive: same submission pool, but slimmed down to the exact register you searched for.
You'll see fresh drops from the last 48 hours, veteran porn caption classics that still pull views, and the tag-graph neighbors people click through to next.
The tag's structured data (Schema.org CollectionPage + BreadcrumbList) is emitted on every render, so Google and Bing treat this as a real porn caption sub-hub rather than a query results dump.
Every visit reshuffles the sort weights slightly, so the same #sli archive rewards repeat trips — the top of the grid tomorrow won't be identical to today.
Every #sli post is a standalone URL with its own share preview, alt text and interaction counts.