[Facebook Group Tool] Automate posting to multiple Facebook groups

Started doing Facebook group marketing for a SaaS I was running. Worked well enough that I wanted to scale it, but doing it manually to 80-100 groups was taking 4-5 hours a week. Built a Chrome extension to handle it. Here's basically how it works: The extension keeps a list of groups with metadata — last posted date, post frequency settings, whether to skip if already posted in the last X days. When you start a session it goes through the list, opens each group, injects the post content into the composer, submits, logs the result, moves on. Facebook's composer is React-controlled, so you can't just set input values the normal way. Standard DOM value assignment doesn't trigger React's state. Had to simulate actual keystrokes to get it to register properly. Groups have different composer layouts depending on whether it's a regular group, a group with post approval, or a marketplace group. Had to build detection logic to identify which type it's dealing with before trying to post. Rate limiting matters a lot. Post too fast and Facebook flags the account. Built in randomized delays between actions not just between posts but between individual interactions within a post. Mimics human timing imperfections. Spintax support ended up being important too. Rotating content variations across groups so you're not posting the identical text 100 times. The extension ended up getting enough interest that I put it on the Chrome Web Store. But the actual automation logic is the part I found interesting to build — React input injection and behavioral mimicry to avoid detection are problems that come up in a lot of browser automation contexts. Happy to go deeper on any of the technical pieces if useful.