Substack launched a new algorithmic feed for Notes yesterday, completing its transformation from “newsletter platform” to “Twitter competitor that actually pays creators.”

The change is significant: Notes previously showed reverse-chronological posts from people you followed. Now it’s “For You”—algorithmically curated content designed to maximize engagement.

What Changed

The algorithm arrived. Previously: follow someone, see their posts. Now: follow someone, maybe see their posts, definitely see content the algorithm thinks you’ll engage with.

Engagement optimization over recency. Popular posts get more distribution regardless of age. A 3-day-old post can dominate your feed if it’s generating reactions.

Recommendations expanded. “You might like” sections appear between followed content. The platform is now actively trying to expand your network rather than just serving your existing one.

Reply threading improved. Substack is leaning into conversation. Long-form replies, quote-posting, threaded discussions—the format increasingly resembles Twitter circa 2015.

Why This Matters

Substack was the anti-Twitter. Chronological, follow-based, algorithm-free. Writers chose it specifically to escape engagement optimization and the toxicity it creates.

Now Substack has the same incentives as every other platform: maximize time-on-site, increase adjacent revenue (subscriptions), optimize for metrics that please investors.

The difference: Substack’s monetization is subscription-based, not ad-based. The algorithm optimizes for “will this lead to paid subscriptions” rather than “will this generate ad impressions.” It’s a different engagement game, but still a game.

Creator Response

Divided, predictably:

Pro-algorithm: “Discovery was broken. My best posts reached 15% of subscribers. Now they find new readers.”

Anti-algorithm: “This is exactly why I left Twitter. The dopamine treadmill, the engagement bait, the anxiety about performance metrics.”

The undecided majority: Watching metrics, waiting to see if revenue increases offset the philosophical discomfort.

The Twitter Comparison

Substack Notes now looks functionally similar to Twitter/X:

  • Algorithmic feed
  • Reply threading
  • Quote-posting
  • Media sharing
  • Trending topics

The differences are business model (subscriptions vs. ads) and culture (longer-form, generally calmer). But the experience is converging.

What This Means for Writers

Discovery improved. If you’re writing shareable content, the algorithm helps find audience. If you’re writing niche content for specific subscribers, the algorithm is irrelevant or harmful.

Engagement pressure increased. Every post now competes for algorithmic attention. The psychological shift from “writing for subscribers” to “writing for the feed” is real.

Platform dependency deepened. Writers who moved to Substack to escape platform risk now face the same dynamic: algorithm changes can destroy visibility overnight.

The Alternative Path

Some writers are responding by:

RSS + email. The original indie web model. Harder discovery, complete control.

Ghost + Mastodon. Self-hosted newsletters, federated social. More technical overhead, zero platform risk.

Newsletter-only. Abandoning Notes entirely, focusing on email where algorithms don’t exist.

The Business Reality

Substack raised $65 million at a $650 million valuation. Investors expect growth. Algorithmic feeds generate more engagement than chronological ones. The math is simple.

Writers nostalgic for the old Substack are mourning a platform that couldn’t exist at this scale and funding level. The VC-backed growth model requires engagement optimization. It’s not optional.

Bottom Line

Substack Notes with an algorithm is just Twitter with longer posts and a paywall option.

That’s not necessarily bad. Twitter worked for years. The subscription model might make it sustainable in ways Twitter never was.

But it’s not different anymore. It’s not the alternative. It’s the mainstream with better monetization.

Writers who wanted to escape the engagement economy haven’t found refuge. They’ve found a slightly more comfortable version of the same treadmill.

The search for a truly writer-centric platform continues. Substack was never going to be it. Now we know for sure.