Hello! We recently ran into an issue here.
Plugin does not have correct permalinks (get_permalink() for og:url etc...) for multisite installation, I suppose - because of the relative permalinks stored in the database in case of multisite. So what we get is links in og: tags which are relative paths (without base url) and an error message about not being able to share because of URL validation failure.
Any help (plugin update with fix) would be highly appreciated.
Thanks in advance.