There are several less known goodies from Github.

1. Public SSH key github[.]com/[username].keys For example, https://github.com/dpaluy.keys

Usage: You are presenting at the conference or making a tutorial and want automatically give an access to attendees. Just ask for their Github username and you can add the public SSH key.

1. Make it pretty with Github Avatar github[.]com/[username].png. Example: https://github.com/dpaluy.png

2. Making secured conversation using (gpg)[https://gpgtools.org/] github[.]com/[username].gpg
   For example: https://github.com/dpaluy.gpg

Happy hacking