A WordPress Multisite network runs several distinct sites off one WordPress installation, and each sub-site keeps its own independent RSS feed — which means RSS auto-posting works across a multisite network exactly the way it does for any standalone WordPress site, just multiplied per sub-site rather than shared.
Each sub-site in a WordPress Multisite network (whether set up as subdomains, like blog1.example.com, or subdirectories, like example.com/blog1) generates its own separate RSS feed at its own /feed/ URL, completely independent of every other sub-site’s feed — WordPress’s native feed generation doesn’t merge or share content across the network by default. This means a network of ten sub-sites has ten separate, independently-updating feeds, not one combined feed for the whole network.
Because each sub-site’s feed is independent, each one needs its own separate auto-posting configuration pointed at that specific sub-site’s feed URL and connected to that sub-site’s specific social accounts — there’s no network-wide setting that automatically propagates auto-posting across every sub-site at once. This is the same underlying pattern as our agency multi-client automation guide, just applied to sub-sites within one WordPress installation instead of entirely separate client websites.
Some Multisite networks activate plugins network-wide (including caching or SEO plugins that touch feed output), which can affect every sub-site’s feed uniformly — worth checking if you’re diagnosing a feed issue across multiple sub-sites at once, since a network-activated plugin misconfiguration shows up everywhere rather than on just one site. Our feed caching guide applies the same way here, just worth checking at the network-activation level first if multiple sub-sites show the same delay simultaneously.
If the goal is one unified social presence posting content from every sub-site, rather than each sub-site having its own separate social accounts, you’d need a feed aggregation step (a plugin or service that combines multiple sub-site feeds into one merged feed) before auto-posting, since WordPress doesn’t generate a combined network feed natively. This is a genuinely different setup goal from most Multisite use cases, where each sub-site typically represents a distinct brand, client, or property with its own separate social presence — worth being clear on which model actually matches your network before building either configuration.
PostRSS connects to any standard RSS feed URL, and each Multisite sub-site produces one — so yes, each sub-site connects to PostRSS individually, the same way any standalone WordPress site would, just configured once per sub-site.
Yes, following the same pattern as any agency managing multiple client sites — one account, with a separate configuration per sub-site feed and its corresponding social accounts, kept independent of each other.
It can, if the plugin’s cache settings apply uniformly across the network without a per-sub-site feed exclusion. Checking the network-activation settings first, rather than each sub-site’s individual settings, is the faster diagnostic if multiple sub-sites show delayed auto-posts at the same time.
WordPress Multisite doesn’t change how RSS auto-posting fundamentally works — it just means as many independent feeds as sub-sites, each needing its own auto-posting configuration. The main things worth checking specifically for a network are network-activated plugins affecting feed output uniformly, and being clear on whether each sub-site needs its own social presence or a genuinely combined one, since only the former works with WordPress’s native feed behavior out of the box.
