Posts not going to Facebook

My posts are not going to Facebook, even though I have all the settings checked and have added the url to add an image to the post on Facebook under the “view this image” setting. I checked to see if there was an update today, but there isn’t. I am also unsure about what Yeost does and whether or not that is an additional plugin. Anything to assist in making this work would be appreciated. Thank you.

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