Like This button not loading

I used to have a Like This button under each post that you could click, but now the button does not appear. Instead it just shows text “Loading…” Does anyone know what would be causing this? I did not add any plugins between the time I last saw it functional and when I noticed the problem. However, I did get updates to various plugins and my theme (as I always get). I don’t even know how I got that option on each post. I have Yoast SEO and Jetpack. Would it be one of those, or is there a setting that I should check?

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