Support Facebook Comments Plugin.

[hydai]

In this commit:
1. Upgrade Facebook SDK from v2.5 to v2.6 (2016/04/12)
2. Support Facebook Comments Plugin

You could find the demonstration via this link.

And the following is the screenshot from my demonstration page:

[iissnan]

Thanks. 👍

[tomroy]

Thank you, this is exactly what I wanted.

[lavicle-zz]

Thank you for your work.
However, the comment widget doesn't show on my site.
Instead, it shows "href should represent a valid URL" in a flash and then disappear where the comment widget should be.
Plus, it seems that facebook sdk works fine for me since the thumb can be displayed.
Thank you! @hydai

Problem solved! After correcting the href, the comment widget shows.