[ubuntu] Ubuntu 14.04.1 LTS + Plesk 12: localhost.localdomain topic

Hi, I've just purchased a VPS with Ubuntu 14.04.1 LTS and Plesk 12 Web Admin Edition. I own just one domain/website, let's say www.example.net. When I access Plesk for the first time, I'm asked to provide the domain name. The default value is localhost.localdomain. Should I leave this value or should I enter my own domain (or some other value)?

Thank you!