Ultimate Facebook - Won't activate

Happy New Year!
I can't activate it. Get this error: Plugin could not be activated because it triggered a fatal error.

And then this info:
Fatal error: Uncaught exception 'Exception' with message 'Facebook needs the CURL PHP extension.' in /var/www/clients/client3/web1/web/wp-content/plugins/wpmu-dev-facebook/lib/external/base_facebook.php:19 Stack trace: #0 /var/www...

It keeps going, but I'm not yet comfortable posting too much. Can I email someone at support or... ? What other info do you need from me to actually help myself or help you help me?