I mentioned the other day in my post about moving to Feedly, that I was unable to share to Facebook via the Feedly desktop app.
Later, I resolved to figure out the problem and fix it. Without going into all the nerdy details, it turns out there was a conflict with one of my Chrome extensions. Specifically DoNotTrackMe.
Once I disabled that extension, I was able to share to Facebook via Feedly.
Hopefully this will save others who run into this issue a little time.