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Not all comments are on Reddit, blogs, niche forums, etc, there may also be comments on IRC, Usenet, Unusenet, Gopher, mailing lists, IPFS, Tor hidden services,
by zzo38computer 6y ago
Not all comments are on Reddit, blogs, niche forums, etc, there may also be comments on IRC, Usenet, Unusenet, Gopher, mailing lists, IPFS, Tor hidden services, FidoNet, FTP, and web pages which are not indexed by Google (or other web searches) (for various reasons). And some are HTTP but not HTML, using other file formats such as plain text, PDF, etc.