Twitter starts marking Substack links with a warning that the link “has been identified by Twitter or our partners as being potentially spammy or unsafe”
Twitter has started marking links to Substack as unsafe. If you click on a link on Twitter with substack.com in the URL …
The episode also coincided with Substack Notes emerging as an alternative social feed; one prominent writer said he would shift there after the block. Twitter later restored likes, reposts, and replies on such posts, although Substack search treatment remained constrained.
First-order effects
People clicking Substack URLs from Twitter face a safety warning, adding immediate friction to traffic referral and potentially undermining trust in linked publications.
Substack writers lose a dependable way to distribute work on Twitter while the warning is active; Twitter controls both the presentation of the link and the user’s path to it.
Second-order effects
Creators and publishers have a stronger incentive to diversify social distribution and build direct audience channels rather than rely on a single platform’s link policies.
A rival feed such as Substack Notes becomes more strategically important when Twitter limits outbound promotion, while Twitter risks making its own network less useful for writers who routinely share external work.
Third-order effects
If platforms increasingly use safety labels and feature restrictions in competitive disputes, link access becomes a meaningful form of platform power rather than a neutral publishing utility.
The incident reinforces a broader push toward audience portability and owned subscriber relationships, though its durability depends on whether platforms sustain such restrictions or reverse them as Twitter did here.
The trend: This is one data point in the growing contest between social platforms and creator-publishing services over who controls discovery, distribution, and the direct audience relationship.
trying this again (last time I linked the substack domain): The link block doesn't seem to affect Substacks that use custom domains. It's literally just blocking subdomains dot substack dot com. absurdly, you can't even reply to tweets that quote tweet those subdomains.
@TitterDaily At the very least REMOVE this despicable “warning” on the Substack link. Who are the cowards at Twitter afraid of a little competition? https://twitter.com/...
What @elonmusk & @Twitter are doing to Substack is wrong & short-sighted. Many draft off the platform, but breaking links by inserting BS “unsafe” warnings is wrong. Old regime blocked links to @nypost, which was wrong too. Twitter is like a common carrier, should act accordingly
Not sure what future this platform holds for me. Subscribe to Slow Boring (even just the free tier) and you'll be able to read my shortform Notes when it comes out of beta next week. https://www.slowboring.com/...
I always figured that Elon's free speech absolutism would have its limits. Just didn't realize that the limit would be posting links to a startup worth less than 2% of what he paid for Twitter.
This is such garbage I am actually thinking it will tip me over into deleting my account. It would really screw up my work but... IDK man It's just so stupid
Was curious so went to @pmarca account. Then clicked on bio link to his Substack. This is what popped up, and I've replicated it elsewhere. If Elon wants to fight with Substack and kill embeds, his perrogative. But this is straight up lying. Twitter knows the link isn't “unsafe” …
somewhere bari weiss is mysteriously dried eyed, despite the threat to her precious ~*~FrEe SpEeCh~*~ that is this twitter warning when you click a substack link https://twitter.com/...
This notice seems instead to be Twitter's latest hostile move toward Substack after the email newsletter platform announced its own Twitter-like “Notes” feature on Wednesday. https://www.theverge.com/...