So I have been enjoying this service. I have an OpenPGP key with a few subkeys (depending on the number of devices I have). What this is great for is the Web of Trust (don't like using that term but most people understand the meaning). It allows me to easily verfiy people I am working on GitHub that I don't know by person but by their GitHub account. This allows me to validate a users credentials before I sign of. This helps prevent others trying to mimic as someone else!
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Keybase.io is very useful for Web of Trust | Heykuki News