F5Bot
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F5Bot is a service for checking Reddit, Hacker News, and Lobsters for keywords and notifying by emails, which can be extracted for links to your personal site as a source of webmentions.
IndieWeb Examples
Peter Molnar
Peter Molnar is using F5Bot for backfeed, with his own email hook to extract links to HTML pages, checking for any of his site domains, and sending them to webmention.io.