Thumbnails in Facebook - Joomla! Forum - community, help and support

when share link of page facebook, shows no thumbnail image.
i think topic discussed many times, tried follow advice found in forum, nothing worked. installed facebook link content image plugin, useless.
i new joomla , website constructing. getting desperate problem, because it's crucial website connect facebook in proper way.
what do?? here website, check how made http://biedarieva.thv.org.ua/
thanks answer!