How to add Google Plus comments to your site. Paste this into your page and voila!

gistfile1.html

<script src="https://apis.google.com/js/plusone.js"></script>
<div id="comments"></div>
<script>
gapi.comments.render('comments', {
    href: window.location,
    width: '624',
    first_party_property: 'BLOGGER',
    view_type: 'FILTERED_POSTMOD'
});
</script>

gistfile2.html

<!-- Similarly, you can add a comment counter to the page as well -->
<script src="https://apis.google.com/js/plusone.js"></script>
<div id="commentscounter"></div>
<script>
gapi.commentcount.render('commentscounter', {
    href: window.location
});
</script>

What is 'BLOGGER'? What is 'FILTERED_POSTMOD'? What are other values for first_party_property and view_type? Where did you get this script?

@Supuhstar I didn't see this comment until now :(

Those properties are something you can customize, and I suggest you do so. This code was borrowed from a blogger post of which I can't find the link to at the moment.