Won’t the same apply to public online conversations (social media, forums)? Anyone can be a bot, and thus I think something like conversing digitally with only

Won’t the same apply to public online conversations (social media, forums)? Anyone can be a bot, and thus I think something like conversing digitally with only those whom you exchanged keys with their phone via bluetooth or NFC irl will be more and more common? I know no solution besides web of trust architecture + irl exchanged keys.