I too have started having problems recently. It was working fine until recently there was an upgrade and after the upgrade when I try to activate I get the following fatal error message.
Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /home/content/a/s/h/ashsmh/html/smashmarketing/wp-content/plugins/onlywire-bookmark-share-button/owbutton_wordpress.php on line 304
https://www.smash-marketing.com