WhatA service that automatically finds and surfaces all discussions of a given blog post across HN, Reddit, Lobsters, Bluesky, and Mastodon, embeddable as a widget or available via API.
SignalReaders and authors both want to find where conversations about a post are happening — authors want to link back to discussions, and readers arriving at a blog want to see others' reactions — but discovering these threads is manual and unreliable today.
Why NowWebMentions never achieved mainstream adoption, but the proliferation of platforms (Bluesky, Threads, Mastodon alongside legacy Reddit/HN) has made the problem worse; meanwhile, better search APIs and LLM-powered matching make automated discovery finally feasible.
MarketBlog platforms (Ghost, WordPress, Hugo), RSS readers, and individual publishers; freemium with paid tiers for high-volume sites; HN Algolia and Reddit search exist but nobody aggregates across all platforms into one embeddable view.
MoatProprietary index of post-to-discussion mappings grows over time; integration partnerships with blog platforms create distribution and switching costs.
POSSE – Publish on your Own Site, Syndicate ElsewhereView discussion ↗ · Article ↗ · 403 pts · March 23, 2026
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