Substack adds the ability to hyperlink mentions of other Substack writers or publications in posts, and cross-posting to amplify other writers or posts in email
On Substack : Tweets: @hamishmckenzie See also Mediagazer Tweets: Hamish McKenzie / @hamishmckenzie : You can now tag people and publications on Substack, with @-mentions. You can also now cross-publish someone else's post to your audience (with all credit going to that writer). These things are rad. https://on.substack.com/... See also Mediagazer
Context & Ripple Effects
Substack has been steadily bolting network features onto what began as a one-writer, one-email-list product. In 2021 it added Sections so a single publication could run multiple newsletters or podcasts like a small newsroom, and co-founder Hamish McKenzie publicly welcomed Facebook and Twitter entering paid newsletters rather than fighting them. This update goes the other direction: @-mentions and credited cross-posting give writers reasons to link and share inside Substack's own graph instead of promoting each other off-platform.
First-order effects
- Writers and publications can now be hyperlinked directly in any post via mentions, and one writer can republish another's post to their own email audience with credit flowing to the original author — turning every subscriber list into a potential distribution channel for peers.
Second-order effects
- Cross-posting creates a reciprocity economy among writers — amplifying peers becomes a low-cost way to earn amplification back, reducing dependence on Twitter for newsletter growth at exactly the moment McKenzie had argued the big platforms' entry into paid newsletters was a net positive for writers.
Third-order effects
- Mentions plus cross-posting are the primitives of a social network layered over email; the through-line from Sections to this feature runs straight to Substack's later launch of Notes, its explicitly feed-like short-form product, suggesting the company is deliberately reassembling the discovery layer that platforms like Twitter had provided.
The trend: Newsletter platforms are absorbing social-network mechanics — mentions, cross-posting, feeds — to internalize writer discovery and distribution that previously happened on Twitter and Facebook.