Email MarketingTrendingmedium impact

Buffer's 92K-Subscriber Substack Shows Notes as a Growth Channel

By InnovaAI Research1 min readBuffer

Buffer's newsletter, The Weekly Scroll, reached 92K+ subscribers through consistent Substack publishing, including daily posting to Substack Notes for a full month. The hands-on experiment reveals a repeatable content distribution pattern agencies can adopt for clients in content-driven niches.

Key Facts

01Buffer's Substack newsletter, The Weekly Scroll, reached 92K+ subscribers through consistent publishing.
02The Buffer team published to Substack Notes every day for a full month, generating direct growth insights.
03Substack Notes functions as an organic discovery channel that can drive newsletter subscriptions without paid spend.
04Daily Notes publishing collapses social content and email list building into a single workflow.
05Content-heavy client verticals such as B2B thought leadership and professional services are the best fit for this strategy.

Why does this matter for agencies?

▶Reaching 92K subscribers through platform-native consistency proves organic email growth is achievable without relying on paid acquisition.
▶Daily publishing cadence on Notes signals a feed-based algorithm that rewards volume, giving agencies a low-cost growth lever to test for clients.
▶Newsletter audiences built through personality-driven content typically show higher engagement than lead-magnet lists, improving long-term client retention metrics.
▶Combining social distribution and email list growth into one channel simplifies agency workflows and reduces the number of platforms clients must manage.

What should agencies do?

Identify one to three existing clients with weekly email content and launch a 30-day Substack Notes pilot, publishing daily short-form posts and tracking subscriber growth weekly against current paid list-growth cost-per-subscriber.

medium effort

Add Substack Notes follower growth and subscription conversions to client reporting dashboards alongside standard social metrics.

low effort

Use Buffer to schedule and plan Substack Notes content alongside other social posts, keeping the daily publishing commitment manageable within existing content workflows.

low effort