Table of Contents
Quick Answer
Build a niche social network (photographers, runners, devs) not a generic one. Use Next.js + Supabase Realtime for live feeds, pgvector for interest-based ranking, AI for moderation. Cold-start with a seeded community of 100 engaged users before opening wide.
- Time to beta: 4-8 weeks
- Cost: $50-300/mo
- Hardest part: Network effects (solve via niche)
What You'll Need
- Next.js 15, TypeScript
- Supabase with Realtime + pgvector
- Push notification service (OneSignal, Firebase)
- AI for content moderation
Steps
- Pick a tight niche. "Social network for knife collectors" beats "Instagram but better." Narrow = identity = retention.
- Build auth & profiles. Supabase Auth. Profile fields: bio, interests (tags), avatar, 1 link. Keep minimal — adding profile depth later is easy.
- Feed schema. posts (id, user_id, content, media_urls, created_at), follows (follower_id, following_id), likes (user_id, post_id), comments (...).
- Build the feed. Start simple: reverse-chronological from follows. Then add: for-you feed via interest embeddings + engagement signals.
- Realtime updates. Supabase Realtime channels per user. New post from followee → update feed. New like/comment → in-app notification.
- AI moderation. Run every post through a moderation API or Claude: detect spam, harassment, illegal content. Auto-flag, human-review queue.
- Notifications. Web push via Push API. Mobile via OneSignal. Digest emails for dormant users ("5 new posts in your niche today").
- Launch strategy. Seeded community — recruit 100 ideal users by DM. Private beta for 2 weeks. Then invite-waves to hit critical mass.
Common Mistakes
- Generic positioning: "A new social network" never works. Be specific.
- Algorithmic feed on day 1: No data, nothing to rank. Start chronological.
- No moderation: One bad actor ruins the community. Moderate from post 1.
- Ignoring export/portability: Users fear lock-in. Offer data export.
- Ads too early: Monetize via subscription or creator tips in first 6 months.
Top Tools
Tool
Best For
Price
Supabase Realtime
Live feeds
Free tier
OneSignal
Push notifications
Free tier
uploadthing / R2
Media storage
$0-10/mo
Resend-alternative
Transactional email
$0-20/mo
Claude Moderation
Content safety
API cost
FAQs
Q: Can I compete with Twitter/Instagram?
Not head-on. Win a niche they ignore (regional, professional, hobby-based).
Q: Should posts be public by default?
Yes — public = SEO + discovery. Private options for sensitive niches.
Q: What's the right retention metric?
D7 retention >30% = healthy community; >50% = great.
Q: Do I need a mobile app?
PWA first (installable). Native app once you hit 5K+ DAU.
Q: How do I handle abuse at scale?
Tiered: AI auto-flag → human mod queue → community flags → suspensions.
Q: Content moderation laws?
DSA (EU), DMCA (US), local rules. Have a takedown process before launch.
Conclusion
Niche social networks win in 2026 because generic platforms feel hostile. Pick a community you love, build the tool you'd use, moderate with care, grow slow and deep. Depth beats breadth.