MISSING Share Sheet options Since High Sierra 10.13.5 OS update

Since the OS 10.13.5 High Sierra update, when selecting Share Sheet menu on Safari, Apps/Extensions like: Facebook, YouTube & Twitter are missing as options from the "Share Sheet" menu.

Does anyone have an explanation or recommendations how to ADD missing Apps/Extensions on the Share Sheet option? Or was this a function of the OS High Sierra update & we just weren't told?

Below are the only extensions now showing on the Share Sheet option