How to leave a message for a github.com user

Need help on GitHub usage. I wonder if there is a way to communicate with a github.com user i.e. write the user a message when only username/id is given on their GitHub page? Does GitHub have this social feature?

This method was working as of Jan 2022

1. Copy and paste the next line into your browser (feel free to
   bookmark it): https://api.github.com/users/xxxxxxx/events/public
2. Find the GitHub username for which you want the email. Replace the
   xxxxxxx in the URL with the person’s GitHub username. Hit Enter.
3. Press Ctrl+F and search for “email”.

As suggested by qbolec, the above steps can be done by using this snippet:

<input id=username type="text" placeholder="github username or repo link">
<button onclick="fetch(`https://api.github.com/users/${username.value.replace(/^.*com[/]([^/]*).*$/,'$1')}/events/public`).then(e=> e.json()).then(e => [...new Set([].concat.apply([],e.filter(x => x.type==='PushEvent').map(x => x.payload.commits.map(c => c.author.email)))).values()]).then(x => results.innerText = x)">GO</button>
<div id=results></div>

Source: Matthew Ferree @ Sourcecon